Ad account managers do not care about impressions that the FB application reports (unless they're Coca-Cola or J&J). They care about the actual conversions, i.e. sales. Those are happening on their internal ecommerce platform, so those aren't stats FB can juice. You can see where the converting traffic is coming from.

If FB's targeting wasn't working, then nobody would have a reason to move away from paying Google and Bing to post ads on search results. FB and Google now own the online ads market, and FB got there in well under a decade.