They weren't pulled because they were never confirmed to begin with. TSSZ puts up rumors that end up being false a lot (Sonic Dimensions on Wii U, Sonic Adventure 3 domains, etc.).
The Sonic Adventure 3 domains were not "rumors". Those were actually registered, the question was by who and for what. If it's worth anything, I saw the news tip we got regarding that and neglected to write anything about it because I myself did not think it was important. Tristan did.
We do not just put up anything that gets sent to our news tip inbox. There's quite a lot we debunk before deciding to run it (you wouldn't believe how many people submitted
this image of Sonic in Project X-Zone, despite it taking literally ten seconds on Google Image Search to see what the original source image was before it was photoshopped).
But I stand behind Tristan on Sonic Dimensions because I was privy to the source it was coming from. The real problem is everybody, including the source, jumped the gun. It was a pitch, not an actual in-development game project. But it was a real pitch - where the information came from was, beyond a shadow of a doubt, absolutely legit and close enough to get that kind of info (and obviously, close enough that if we said where, exactly, it came from, there would be very dire consequences).
The nature of getting information ahead of release means that even if your information was right at the time, it may not always end up being right by the time the game itself gets released. The further in advance you get your information, the more likely it will be that the information changes on down the line.