Sounds good on paper, but with half my family believing that covid is caused by 5G, I can tell you, all this will do is make them see anyone verified as "brainwashed sheep" and they'll continue to get their advice from charlatans.
In UK NHS webpages are very good. And outside of UK, I guess adding NHS to the search query would bring NHS pages as top results. For health related information I don't think people should consult youtube anyway.
I don't really get health advice from YouTube, but yeah, it would be useful for those who do. It just won't be any help for those who actually want to be misinformed, sadly.