I think that the line between A"I" editing to fix grammar or to translate from a different native language and A"I" editing by using an LLM is one of those things that's very hard to unambiguously encode in written guidelines, but easy to intuitively understand using common sense, in the vein of I know it when I see it.

https://en.wikipedia.org/wiki/I_know_it_when_I_see_it