That was literally the same thought that crossed my mind. I agree wholeheartedly, accusing everything and everyone of being AI is getting old fast. Part of me is happy that the skepticism takes hold quickly, but I don't think it's necessary for everyone to demonstrate that they are a good skeptic.
(and I suspect that plenty of people will remain credulous anyway, AI slop is going to be rough to deal with for the foreseeable future).
Also, an AI comment might have a worthwhile point to be addressed. Pointing out something was written in a new way is not addressing the point.