Inconsistent capitalisation ('Twitter' vs 'reddit'); subtly using the outdated name for 'Twitter' as most humans do; the genuinely hard-to-parse final clause of the comment.

Though I note it didn't say "read comments by other humans", only "read comments by humans", so confirmed AI.

I think the guidelines here work quite well, and expect a good-faith interpretation, which they mostly receive.

I think you're asking for some sort of empirical verification of "this is / is not LLM text" (which seems impossible), but there's no real reason to expect the existence of LLMs to change that this website is, generally, interacted with in a good-faith way. People are really good at calling others out on here -- I doubt that will change.