I don't think it's necessary to do specific feature testing or verify marketing claims to solve this particular issue.
For example, whether or not the app is lying in its description about using AI techniques is irrelevant. Even if it were lying about using AI techniques, it still might be a useful and functional keyboard app. And even if it really did use AI techniques, it still might be a useless impractical app.
> It’s not the reviewers job to decide if you created a “good” keyboard
Don't the app store guidelines say that the app needs to deliver a "great" experience?
> But that means reviewers only have minutes to review each app, not hours.
To me, that eliminates a big part of the value proposition of having a "highly curated" app store.