It would be downvoted so fast for being so wrong, and no one would engage with it for being so terribly wrong because disproving all the points is exhausting and not worth the time. Yet, you would think it OK on HN.
Maybe you downvote some of the wrong ones, but others get lots of comments, and soon all these wrong posts just get more attention and comments as people are arguing over half-made points in a blog post by a sales guy that "has a few software friends".
The long-term changes to HN would eventually push away people that care.
But we don't live in that world, maybe not yet. So instead we allow people who get so many basic facts wrong about an epidemic to post on HN, and @dang explained elsewhere why this makes sense (and I agree from a moderating standpoint to keep this content up) and I agree with it.
But we really only allow this content because it isn't the bulk of content on HN. If the bulk of content on HN resembled the above, I don't think we would like the community HN becomes.
Quite ironically, this is highly related to the virus itself. The virus isn't a problem on its own. It is a problem because it infects hundreds of millions of people very quickly, and we have poor means for slowing or stopping it at all.
Very much like misinformation.