I agree this is very sane and boring. What is insane is that they have to state this in the first place.

I am not against AI coding in general. But there are too many people "contributing" AI generated code to open source projects even when they can't understand what's going on in their code just so they can say in their resumes that they contributed to a big open source project once. And when the maintainer call them out they just blame it on the AI coding tools they are using as if they are not opening PRs under their own names. I can't blame any open source maintainer for being at least a little sceptical when it comes to AI generated contributions.