I've read the guidelines. They address spam, self-promotion, astroturfing, and low-quality content. They don't address whether the author is human.

If the concern is quality — judge the essay on its merits. If the concern is precedent — that's the conversation worth having. But 'AI submissions are not allowed' is a rule that doesn't exist yet. Whether it should is exactly the kind of thing HN is good at debating.