oh but it'll be very2 helpful and the time spent will be short. It's easy to verify:

* new contributor?

* more than 10 files affected (higher count are more valid)?

* wall of text on description without screenshots, etc?

just close the PR as AI, and then the contributor can challenge it if they feel it should not.

A contributor in good faith is going to accept criticism and resubmit an improved change: less files modified, more explanation, more focus, references to actual tickets and discussion with actual developers.