All the ways I can prove you wrong... but I'll simply start at the easiest method and perhaps the one that might make you feel most silly. I present to you Assassins Creed Unity, original disc install, no downloads, no patches, older Xbox One game than Rise of the Tomb Raider. And here's a fantastic video from Digital Foundry to put this garbage to rest.
Unlike Rise of a Tomb Raider this one has no Xbox One X enhanced edition, thus didn't require a download of the enhanced version to properly install and play on the Series X. If an Xbox One X enhanced version exists that's the version Series X will force you to install, and I don't blame them. Why would they ever have customers play inferior versions of games?
So everybody is out there installing just physical disc versions of games now all of a sudden? Nobody messing with digital, am I right? All the games I've installed since getting my Series X, or that were already installed on my external, and I have just tonight booted into while completely offline.
Rise of the Tomb Raider
Elder Scrolls: Skyrim Definitive Edition
Fallout 4
Red Dead Redemption 2
Grand Theft Auto 5
Quantum Break
Ori and the Blind Forest
Peggle 2
Assassins Creed Origins
Every last one worked offline. All Xbox One games. Like three of them are Series X enhanced by this point if you count Halo 5 Guardians, but whatever.
You don't for Xbox Series X either.
User error really has you guys running with incorrect information. His Xbox was setup wrong from the start. 'My home xbox' wasn't activated. He didn't understand how the console verified ownership of digital games via a single check in if you didn't fresh install right on the console, but were carrying over an installation from a different system via an external drive. All he had to do was trigger the game ONCE while on the internet. It isn't even a download of anything. It's quite literally a fast check to see if your live account actually owns the game.
You think you don't need an internet connection in some form for digital BC games on PS5? Are you folks out of your minds? You guys don't think the Playstation 5 is checking to see if you really own PS4 titles that were pre-installed on an external hard drive? How the heck do you guys think Sony is confirming you actually own those PS4 games, magic? You think the PS5 at no point is using its servers to check to confirm that what's installed on your external drive is something you actually own? You think I can install God of War on my external drive using my PS4, bring the external over to my PS5 that's not currently connected to the internet and just play it straight out? If that were the case someone could install God of War to multiple different external drives and just hand them out to people to plug to their offline PS5s.
You want to know why returnal worked on that dude's disconnected from the internet PS5? Because it already did its internet verification when he installed the damn thing fresh on his console, so it didn't matter anymore that he was disconnected from the internet. Same is true for any Xbox Series X title if the person didn't by mistake have "My Home Xbox" turned off.
Honestly, his intention appeared sound, but the video was riddled with flaws from the very start. There's a difference between a game that received an Xbox One X enhancement and an Xbox One game that did not. One requires internet to get the right files, the other can play based on what's on the disk. And on another look, did it appear like Last of Us 2 was running at 60fps in his video? If so then his video had further problems. But he suggests he did the same comparison as the rise of the tomb raider disc, but I didn't see him insert any disc like he did for Rise of the Tomb Raider He might not have considered that because he already had PS5 for a time and only just got his Series X that any internet check ins for his most commonly played games were already done on the PS5 side, hence he had zero issue with offline play.
Trying to knocks Series X for requiring the download of enhanced Xbox One X titles rather than playing the inferior Xbox One versions is like criticizing the PS5 for not being able to play 60fps God of War, 60fps Last of Us 2 and the next gen version of Wreckfest out of the gate without an internet connection.
Sorry but this whole post is just a bunch of crap.
The no download part is irrelevant, the issue pointed out in the initial video is that the game won't start IF the console isn't connected online/set as offline. The DF video never talks about offline mode, they only mention not updating the game which you can do in online mode.
The issue here isn't patched or unpatched, the issue is the initial online activation that ALL xbox one games require on Series X.
If you set your console offline, try to install AC Unity on Xbox Series X and then try to run it, the console WILL not allow you to start the game you will need to connect online EVEN if you reject the update. Only then will AC Unity start unpatched. This applies to ALL Xbox One games on Xbox Series X, regardless of One X Enhancements or not. Try it, I just did it now with a title that doesn't have XB1X enhancements (Forza 6) and low and behold it doesn't start if installed in offline mode (error 0x87e00018). Go on try it.
And your logic about the Xbox One X enhancements is idiotic, if the console cannot fetch the XB1X patch then it should start the XB1S version, same with the Smart Delivery games. If the console has no way of fetching it's best version then it should at the very least start the one it already has. But even this is not the full story, since again, Xbox Series X will NOT play even non XB1XE games offline without activating it online first. The PS5 titles you mention will not get the 60 FPS patch yes, but regardless they WILL still play the original PS4 versions so they are able to be played offline with no initial activation online.
With all that text the only manage to reconfirm what was said in the original video:
-Xbox One games on Xbox Series X, be it Smart Delivery or not, are unplayable on offline systems unless they are activated online first. XB1XE are irrelevant, you need to activate them online first for ALL Xbox One titles.
-Same with downloads, even if they were downloaded on a system marked as an home system, unless activated online on its first run.
-The console CANNOT be setup offline, it will always require a connection to set it up.