Maybe because it's a stupid issue that doesn't matter in any way.
As stated by lawyers on this board, even IF (and that if is a chance of about 0.00001%) it is a forgery, that doesn't necessarily mean he would lose a constitutional challenge.
I love how they point out how Pravda is reporting on the story. Yeah, Pravda has no reason to stir up the hornets nest on this. None.
Anyone even discussing this is a crackpot. You included.