I've also noticed that very obviously LLM-generated comments are called out, and the community tends to agree, but those that have any plausible deniability are given far too much leniency, and people will over-index on the guidelines to give them the benefit of the doubt.
I don't think a captcha is the solution, as it'll degrade conversation by an OOM though.
The one thing I like about this place is that it's well moderated and you have shared opposing view points engaging (mostly) respectfully.
My personal and political views couldn't be further from most HN users (I'm both a Conservative _and_ a practicing Christian), yet I appreciate taking part in various discussion. I enjoy reading about point of views that directly challenge mine.
Let's keep HN respectful and accessible.