Well now I know who "Whistleblower" is. He's a dillusional poster on GB that goes by the name of R.E.D, who's been trying to push his frankly ridiculous theories about what's "really" happening in the series (including The Doctor being dead since The Big Bang) on people at every possible opportunity.
So, in other words, it's probably fake? A shame, I kind of liked it. But, yeah some of the stuff does seem unlikely, particularly the bit that says the portraits of the past Doctors show some of them aging. In order to do that, they are presumably going to get the surviving actors, showing them as they are now. But it is now confirmed the only previous Doctor to return is Tennant.