I think most people see the issue there with the "well audited" part. You didn't know which developers just copy pasted stack overflow code together before either, but the rate at which that code came in was manageable for reviews, and supplementing reviews with AI doesn't really lower the concern for people concerned about the quality of the code.

The alternative would be to rely on self-policing, which is a bad idea. Not even because you can't trust people to not be lazy, but simply because there's also actively bad actors involved.

If the code is well reviewed/audited, of course it doesn't really matter or not if it was hand-typed or generated, it's (at least for me) more of a question on how to manage quality control.