HN's guidelines aren't "laws" to be "enforced", they're a list of unwelcome behaviors. There is value in setting expectations for participants in a community, even if some will choose to break them and get away with it.
If comments by LLMs were actually as valuable & insightful as human comments there would be no need for the rule. The rule is in place because they usually aren't.
Relavent xkcd https://xkcd.com/810/