Yeah, and humanity used to believe in miasma theory too. Fauci being wrong and then correcting himself later is a good thing, actually.
It's not a good thing since he wasn't correcting himself, he was misinforming others whilst knowing what he was saying wasn't accurate.
I don't really care, since most of the quote is good information and the rest of the quote was made to serve a political purpose.
The science on masks points to them helping when used correctly, but many people use them incorrectly - not following the proper procedure for putting them on, taking them off, reuse and disposal.