It's often really tough to make the call on whether someone is genuinely asking and when they're seeding doubt (people going back and forth on a topic makes something seem under debate) or even plain trolling and trying to waste other's time (since it's so much quicker to ask the question than to adequately answer it). This particular case is a pretty plain question, I'm more speaking of the general case.

What might also be worth to realize that the illusory truth effect is a thing, i.e. "the tendency to believe false information to be correct after repeated exposure." "[A 2015] study suggested that the truth effect can influence participants who actually knew the correct answer to begin with, but who were swayed to believe otherwise through the repetition of a falsehood." (From Wikipedia.) I can understand why one might choose to downvote such a "genuine" question when it's easy to find that the answer is "no" (it's mentioned on the COVID-19 misinformation Wikipedia page).