You seem to have misread the question.
no-ai means that no ai was used. It is not a warding sign against ai scrapers to not visit.
So many misunderstandings here. I deleted my post above, it had an explanation too, but OP was offended because I asked an AI how AI are trained.
It kinda is explained here https://itch.io/t/4309690/generative-ai-disclosure-tagging , but people tagging their projects or browsing for things might not have read that. Even after reading, it is not that intiuitve.
The AI disclosure creates virtual tags that are not visible on a page, but can be filtered with the tag system regardles. And because Itch has freestyle tagging, those virtual tags also exist as regular tags. I suspect that the OP stems from that quirk. The projects of OP are already tagged no-ai because of the ai disclosure, so musing over tagging them no-ai will lead to nowhere. Unless OP want's a discussion if one should also tag it manually.