No, Joe is on the ballot and Joe isn’t going to get the votes if he is withdrawn. If there was a move to have electors vote for anyone else, state legislatures would get involved and replace the electors. Just this year in CHIAFALO ET AL. v. WASHINGTON, SCOTUS ruled that state houses can compel electors to vote for the winning candidate, or replace them. Any state with a R legislature would appoint electors for the candidate that received the most votes. All of the states Trump won in 2016 have R legislatures.
You do have a good point. The Constitution gives state legislatures the final say on allocating Electors. But Joe really isn’t on the ballot. Yes his name is there, but on the ballots I have cast, there is a bit of fine print: “Electors pledged to vote for...” in front of the candidate’s name. I don’t know if any states actually list the Electors’ names on the ballot.
And I am aware that SCOTUS did allow that states can punish ‘faithless electors’, but I don’t know if it compiles them to. Dem-controlled legislatures no doubt will have no problem democrat electors voting for a democrat substitute.