I have a similar attitude to PRs on my projects even though I don't use LLMs. Doing something myself is just simply faster that reviewing someone else's code, it's potential to be malicious, wasting time on the back and forth, contributors not following the project standards.
LLM's may be a piece of the puzzle for this guy, but I have the same opinion without them.
Yeah, it is very different with a team member / known long time contributor. I am taking about random people opening a PR.