[jerf]

This guy claims to be from our culture ~20 years in the future. Your question seems to be something like "Yeah, but what if everything was completely different?"

Not terribly relevant in this case since I doubt anybody is even remotely fooled, but more interesting in the Jon Titor case, where I think many people were (albeit with a certain amount of willingness). He kept his predictions close to his chest and tried to play off any inaccuracies as issues with "alternate realities", but if that is true and you're not even in your own past anyhow there really wasn't very much reason not to be far more free with the details of the timeline that we may not even be in.