Tonight I found a new review that included a link to the provider's page. The page included a link to the review. The original ad was posted in February. Are ads simply edited to include the review? I've seen this kind of thing before and it's always seemed a little questionable to me. Anyone?

I posted about the same things a couple weeks back.  The best explanation I got was exactly what you suspect, that the ad gets updated to include the new review link.  I was think more along the lines of time travel.  I must have watched too much "Back to the Future".

This has to do with how BP ads work.  When a provider renews or reposts an ad, the url link for that ad is still the same. They have the option to make changes to the ad and they probably include a review link in it before reposting.

This is also the reason for why a provider's profile with just 1 review posted in April shows a link to a BP ad in June.

Gotcha. Thanks folks.