While I strongly disagree with pretty much all of this (especially me being a smart guy), that's not really the point. You'll notice that this conversation wasn't really about the COVID vaccine, since what sparked the conversation was a video that came out 5 years before the COVID vaccine was available. Once it was shown that the vaccine was not reducing the spread of COVID, the potential for third party damage wasn't really there anymore. I might disagree with you and think these "died suddenly" claims are pretty silly, but hey, free country.
Where I do get a little more prone to chime in is when someone posts a literal flat earther, whose other genius medical advice includes "don't take cancer treatments those make you sicker, fruit can cure you", "gravity is a toxin", and "you can shock viruses out of you", and citing him to justify the ridiculous "vaccines cause autism" claims that have been proven wrong over and over and over and over again since they were first promoted by that quack in the late 90's (with a dose of "they want to kill all white people" garbage thrown in for fun, of course). Those vaccines, in addition to claims of them being dangerous being predictably absolute bunk, absolutely do stop & slow transmission of those diseases, so when you encourage parents not to vaccinate their children from disease, not only are you needlessly putting those kids at risk, you're putting other kids and adults at risk too, which is a problem we've been seeing more and more over the last 15 years or so.