It depends. Could you easily determine in this case that it was "AI slop"? I have used LLMs before for PRs, but not with having my brain turned off, and it got merged because it was legitimate, and I would have never sent the PR without doing my own careful review. I may be in the minority, who knows.
You are a minority.
That is quite sad if this is true. I would have never submitted a PR without knowing everything about the code I had generated. I manually looked up the RFC for test vectors, because the LLM sucked at it, and I generated the tests and made sure it is correct and in accordance to the RFC. The test included edge cases, too, and all the tests found in the RFC. I had to know a lot, and do my own research a lot, for the LLM to be useful, to be honest. I do not think LLMs are there (yet at least).