How about this - US Surgeon General claiming masks are ineffective against the coronavirus, just four years ago: http://web.archive.org/web/20200301001854/https://twitter.co...

That's as far as I'll go since I am about to head to work, and I've spent enough time playing the game where I'm told to dig for articles by people who don't bother doing it themselves, so hopefully this is satisfactory. The deletion should be telling, there's a lot of retconning and memory-holing going on unsurprisingly.