Fantastic. I would be thrilled to see other tech companies declare a holy war against this kind of misinformation. In fact, it would make me ecstatic if they started doing the same with other topics that have overwhelming scientific consensus, like climate change. I frankly don't care if it's censorship. It's a hill I'll happily die on.
Phlogiston, luminiferous aether, and Newtonian mechanics also once had "overwhelming scientific consensus". " The ends do not justify the means. " Even for something as important as addressing climate change.
As for phlogiston and luminiferous aether - yes, science is not omniscient. But those hypotheses are attributable to insufficiently precise instruments and knowledge.
More importantly, they were positive statements about the world. You're comparing them to the demand for evidence that vaccinations are harmful, to which the best rebuttal is a counter-demand to prove a negative (that they're not harmful).
What else you got?