Earlier quoted context omitted.
The problem is you have an authority deciding what supposedly is fact and what is not fact.
And who is that problematic authority? The social network defers to the fact-checkers, of whom there are multiple independent ones, and who should be corroborating the government's story not taking it at face value.
After all, we generally can't check each observation or theory ourselves first hand. Deciding which sources are trustworthy and which are not is a critical issue.