You are correct IMO and if they want to change things they would have to change the constitution.
Just learned this today.
States don’t count their absentee ballots unless the number of outstanding absentee ballots is larger than the state margin of difference. If there is a margin of 1,000 votes counted and there are 1,300 absentee ballots outstanding, then the state tabulates those. If the number of outstanding absentee ballots wouldn’t influence the election results, then the absentee ballots aren’t counted.