Skepticism is one thing, jumping straight to "they're all screenshots, they're all fake" is another.
Yeah you can perform the trick yourself, but these all are about male parts somehow.
No, you can easily reproduce this behavior yourself (I did)
Indeed, I just run it (GPT-3.5-turbo) in a loop on increasingly long sequences of "b b b b ....", and it went off the rails somewhere around 200+ 'b's.