You keep bringing that up, but Long Covid is exceptionally well documented at this point. We can't pretend it's entirely in peoples heads like you seem to be doing.
People have staked their whole identity on the whole thing being a hoax. I have a (ex) friend convinced that billions of people died of heart failure specifically due to the vaccine and the whole thing was covered up, and his evidence is basically that he believes the virus wasn’t real and the vaccine was some kind of government plan to murder everyone. What can you say to that? He will just keep doubling down forever at this point.