The note emerged some 2-3 hours after the original post. 

1) When has a corporate "fact checker" ever been faster than that; and...

2) What mechanism was there for any of the official fact checkers used by FB, etc., to get checked themselves? 

PolitiFact, WaPo, and other Newsguard-type fact checkers got (and still get) stuff wrong constantly, but their notes were not subject to community review; there was no decent way to appeal the application of a fact check note; and the system applying the fact checks would apply it even to posts that were, themselves, criticizing the thing being fact checked... and any sharing of a "fact-checked" post would be demoted and your account would eventually become demoted outright.

The absolute faith some people have in such a garbage system is baffling. The only thing that really makes sense is if they just personally liked the narrative-control aspect of it.