Fair enough, if you didnt mean what you said literally and were just trying to say that biden got an unusually high popular vote that is higher than what democrats typically have gotten, then sure. I will be happy to grant you that.
That said it isnt particularly compelling on its own as an argument for election fraud, especially since he only ran once, so we have no idea. I mean if that is the argument used one could say the same aboutn Trump, that he got an unusually high popular vote as well compared to past elections.