I think they are saying that since vaccinations began, 45K people have died within 3 days of receiving their shots. Not that 45K died from the shots over a specific 3 day period. And that this figure was covered up and not published anywhere.
Still sounds crazy. VAERS “only” has around 9-10K reported deaths from the vaccines.
Will need proof on this for sure (if true) but it very likely is fake news.