If you can't tell if a text was modified by AI, then all accusations that a text was written by AI must be ignored. Not without strong evidence.

Yet here we are: The mere accusation of a work being touched in any way by AI is all it takes for publishers to drop it like they were just handed molten iron.

AI is being treated by publishers and traditional authors like the fruit of the poisonous tree. This won't stop anyone from using AI to aid their work in various degrees, but what it will do is force everyone to lie about it.