Is it? If by higher quality, you mean commenting properly, sticking to naming conventions etc. I can agree. But to me, AIslop looks like it lacks "intentionality" of code written by devs, no matter how bad they are at naming things and sticking to conventions.
i.e. people who are adequately good at their jobs usually do things for a reason, and they can explain it. Even if you don't find it agreeable, it usually is consistent.
Just remember we are comparing slops. If you care about your code it really doesn't matter if you write it manually or with the help of a glorified typewriter.
How did you come to that conclusion? That goes against everything I've heard from people who understand development. Every resource I can find about AI vs non-AI development comes to the exact opposite conclusion you did.