Sure, but that pull request is blatantly unreviewable because of how it bundles dozens of entirely unrelated commits together. Just say that and move on: it only takes a one-line comment and it informs potential contributors about what to avoid if any of them is lurking the repo.
Sounds like we're largely saying the same thing. Open source maintainers should feel empowered to say "nope, this is slop, not reading, bye" and ban you from the repo, without worrying if that seems unprofessional.
One problem with giving any feedback is that it can automatically be used by an agent to make another PR.