Perhaps so, but you still have to show that it is happening, not merely that it is possible. Moreover, you have to show that whatever cures you propose are both 1/proportional to the harm and 2/minimize undesirable side effects. (One challenge with the latter is that for some people, those side effects are actually desirable.)

Can you describe specifically how someone finds enough complaint-free absentee ballots and sick friends to vote at any meaningful scale?

Doing this even 10 times seems unbelievably hard.