Earlier quoted context omitted.
But equally - does it matter? I would rather have less, but more accurate, reviews than have all of them but many of them being fake. It seems like a use-case where a high false positive rate would be acceptable. Unlike say, medical diagnosis or something.
If legit reviewers have their work deleted because of FPs they get annoyed and won't write more reviews, they may even stop using the site entirely.
A bit deceitful but maybe better for UX.