The Dem constituencies botch their mail in ballots beyond repair at a 4x rate compared to others. Courts cannot repair botched ballots. They can fix late and no postmark. But when it’s done the ballot still has to be signed, dated, marked correctly, etc.
I think they realized mail- in may hurt them. The Dem runs states that are sure Biden votes may not have been able to certify in time. Versus toss up and R states that will have no problems certifying their electors.
Or the Dems are tossing a head fake and fully intend to exploit mail in voting.
Nov.3rd is the beginning, not the end of this Election. The Dems have tanted the vote box. One box left.