Change is bad unless it's great.
Unless the change is an obvious improvement, it has to be worth the time for the maintainers to spend attention reviewing it (and supporting the code forever, and all the rest).
Even if these particular changes are "harmless" and easy to review, accepting them sets a precedent that encourages an unsustainable flood of AI-generated changes that will overwhelm the project.
That’s a totally unnecessary high bar you’re setting. Most change is mediocre (a tautology, I realize). I really don’t believe that you can think that fixing a bunch of spelling mistakes is not a small improvement.
About setting a precedent: if you think like that you probably never accept any contributions at all, by humans or otherwise. Contributions by strangers have always been very minor things in general, things that the author cared enough about to make a pull request. In this case I don’t see the difference except for the fact that ai was used. If you just don’t accept ai at all , fine. But just be clear about it. In this case they are calling spelling correction slop. That’s not what slop means. Pretending human contributions were always “great” and nothing else would do is kind of ridiculous and shows a lack of experience in open source.