Generated comments and bots have never been allowed on HN (other than https://news.ycombinator.com/user?id=whoishiring of course), since long before ChatGPT. I've written about this a few times, e.g.:

https://news.ycombinator.com/item?id=33950747 (Dec 2022)

https://news.ycombinator.com/item?id=24189762 (Aug 2020)

https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...

Whether to add it to the formal guidelines (https://news.ycombinator.com/newsguidelines.html) is a different question, of course. I'm reluctant to do that, partly because it arguably follows from what's there, partly because this is still a pretty fuzzy area that is rapidly evolving, and partly because the community is already handling this issue pretty well.

One important thing to know: plenty of things not allowed in HN don't show up explicitly in the site guidelines. They are in no way a comprehensive list, and never will be!