I'm certainly no expert, but I'm also not sure re that assertion.
The crop I posted above was taken from the original post by CMB @ #142.
I zoomed way in on it just now with PS and there seems to be about the same amount of pixelization around all the other elements as around hat boy.
If it IS a fake, it's a damned good one, especially given the short amount of time since the presser at 5pm .. the mortar in the background brickwork, if faked, was faked by a pro.
Who knows. I’m sure the pro’s are looking at it. Hope it’s real so it can get more info for the FBI.