From the same guidelines:
reply> Please don't post insinuations about astroturfing, shilling, brigading, foreign agents, and the like. It degrades discussion and is usually mistaken. If you're worried about abuse, email hn@ycombinator.com and we'll look at the data.
I don’t see anything in there about not commenting on whether the author is using an LLM?
replyThat's covered under
reply> Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something.
If there are specific tells that the text has been AI generated, point them out! A lazy drive by of "that's AI!" doesn't teach anything.