It would still require a Jan 3 Congress to certify the vote. Do you think a Democratic Congress will certify that?
So, you would need to have the current, razor thing Congress go along with not extending the deadlines for electors. You would need to have the Supreme Court delay the state rulings past the deadline. Then you would need the SC to rule that the completely arbitrary, not-Constitutionally mandated deadline would take priority to recognizing the votes of millions of people. Then you would need the Jan 3 Congress to certify the obviously tainted election. Then you would need Biden to handing the keys over to Trump, someone who is obviously a fascist dictator who seized power by undemocratic, unConstitutional ways. If you get past the third step, with the SC, it may get into some "constitutional crisis" grey area, but there is still a lot of off-ramps before handing the keys over to Trump.