It's against the rules as of 2 weeks ago, in the short term, you're more likely to get downvoted for complaining than see less of it.
And it's astounding. Because this is awful writing.
Author, one year ago: "you replied to an LLM generated comment. if you look at the posting history you can confirm it"
Now they can't be bothered to take an edit pass on the most rote slop.
Technically it's against the rules to use AI for comments. I don't think you have to be 100% sure that AI wasn't used for a submission before submitting or upvoting