I think you misunderstood the quote. It is saying that if you take 10 million people the background rate of death, disease, stroke etc., (unrelated to vaccine)

I think you misunderstood the quote. It is saying that if you take 10 million people the background rate of death, disease, stroke etc., (unrelated to vaccine) will be high and a confounding issue, even if you didn’t give them the vaccine. Edit: I think you have a point about whether those who have previous infection truly need the vaccine, but the way you are using VAERS data diminishes your point