> I furthermore wish that "posting an LLM-generated comment (i.e. and passing it off as your own)" was worthy of an instant ban

It pretty much is. It’s not hard and fast (sometimes we’ll warn people or email them to ask if it’s not certain) and it takes time for us to see things and act, especially when people don’t email us when they see these comments.

But as a general rule, accounts that post generated comments get banned.