From what I understand, a lot of AI text detectors work from measuring “perplexity and burstiness” which basically means, lower randomness, lower emotion, and sentence uniformity is more likely to get flagged as AI text. Those are all things that can be associated with neurodivergence, so I see where that statement would come from. That’s also the way you are expected to write formal essays.

As for plagiarism detectors, I don’t know much about them except that they false flag the shit out of everything.