I just noticed this as well when I was talking about it to a friend and wanted to show it to him, and the links were down...
Seriously wtf? Even the video and the "game" menu itself explicitly say that this isn't a commercial / official product and won't be released as an executable game, it's just an artwork video.
So where is the line then? Why is this not allowed but fan arts, cosplays, drawings etc are allowed?
As someone who learn unreal engine and thought about recreating some environments from different existing stuff, I find it sad and frustrating that you can't do that even if you don't actually release any "game". It seems like it's a blurry subjects and it's forbidden as soon as it get close to the video game media, even if it's not actually a game, because I don't see why you can't recreate a 3D interactive environment like this, but you can post other type of 3D or 2D arts with no problems, it's weird.
I don't know, I just find this extremely frustrating.