I think they cull their info from posted Backpage ads.  I'm listed on there but apparently they have the wrong phone number for me?  Dunno why.  I just ignore it and recommend that you do as well.

A LE threat is always scare, but this page doesn't look credible.

There are 100+ girls listed under NYC.
Seems far fetched that:
a) There are THAT many police ads
b) That someone would know all the police-bust numbers

I browsed a little to see what the site-owner's motive might be.

Note that when you click "Register" at the bottom of the page, it goes straight to Adult Friend Finder's site.

When you click "Ad Removal," it lists your supposed IP address. (Scare tactic? Although it didn't have my IP address correct).
Then it asks for your name and email, maybe so AFF can spam mail you later.

Very sketchy.

and sometimes you got to know the site to even listen. A few review sites spam bot review the ladies crap reviews not even about the session.  

I did a lot of research to see if it was even true in my area and it was almost all gals who haven't been reviewed in a few years.

You can always ask the reviewers if he has seen her lately, some might not have recent reviews.If they gave a good review, he should be seeing her of course.

That should be enough to ease your mind and P411 handles that sort of stuff immediately. So between the two, if she checks out.... she is safe. I am not listed on there but a few I know are and they did NOT get busted.

The first two Google hits for this website contained grammatical and spelling errors...

Not the best way to establish credibility.