I think the reason this can't be found is because it doesn't exist. It sounds like something a TV or internet commentator would say cynically: "Well, you know, Biden doesn't want you to get a vaccine, since it would mean Trump did something right..." or some such stuff. The other bobbleheads on the panel all nod in agreement and the viewers are left to think, and to remember, that Biden didn't want people to get vaccinated. This is how gaslighting media outlets plant false memories into the heads of otherwise sane and rational people.
He's talking about that period when the vaccines were being fast tracked to be released prior to the election, when Kamala Harris and Biden both said this or that about not wanting to take a vaccine that was rushed to market for political reasons and to just release it when it was ready. That's a far cry from "convincing the public to refuse to take vaccines", of course, which is where the false memories thing comes into play.
There's been plenty of revisionist history going on, but that kind of makes sense...if one side is saying things that are tremendously hard to defend, the other side will try to embellish their end of things to match. Can't use what-about-ism without a balance of sensationalized narratives, after all.
But its based on the 'push' concept.
Push people in the direction they're inclined to go in the voting booth anyway - but give them more comfort and excuse and phony indoctrination to motivate them to show up and then do that.