All the Dems have left in their quiver is "close ranks and defeat the evil Trump who is a threat to Our Democracy (c)" as if nothing else matters. To many of their voters, nothing else does.
Yes - Joe's continued presence has no effect on the generation of fraudulent ballots - it just makes that effort harder to hide than it was in 2020. But even exposure equivalent to the recent debate debacle isn't going to change many minds. It might scare the low-level operatives enough to minimize the level of fraud - probably the best we can hope for.