They can auto generate warning messages on every video even tangentially referencing the c-word for 2 years, but they let this kind of thing slide for years and years.
Ignoring the politics & posturing, my impression is that the number of people dead due to stupidity about COVID-19 is a few orders of magnitude larger than the number of people dead due to this sort of video.
I don't think the point was about the relative number of dead; I think it the observation that YT clearly has the technology to automatically annotate content, but declines to use it for things (like dangerous hacks) where it could save lives.
Reasonable...but I suspect that YT's "technology to automatically annotate..." is actually pretty sucky in the real world - high error rates, lots of (paid hourly) moderation needed, pushback from Legal on "issues and exposure" that it creates, etc. So they're not gonna deploy that tech against hazards which don't have a huge body count and/or political weight behind 'em.
They still push anti vaxxer conspiracy theory crap, but they immediately banned actual tenured scientists with decades of experience writing and reviewing papers on pandemic response.
If anything, their treatment of this video is par for the course. They're banning the factually correct content, and pushing popular misinformation that kills people.