AFAIK this was always the plan, they were just getting bombarded in so much Slop that they made a full pause on all AI assisted work. There still is this part of the policy:

Reviewers may reject a submission, including without further review, based on the extent or role of generated material or concerns about its review, quality, or maintainability.

which is intended to get rid of the completely vibecoded slop. Flathub is taking a similar stance to it as to proprietary software: They allow it but don't support it