In this case, the Republican party is objectively authoritarian - and arguably neofascist. For all of the faults of the Democrats (and there are many) they are not actively hammering on the foundations of Democracy. Their leader did not just attempt to overthrow an election. They aren't actively undermining the ability to vote, or trying to put corrupt officials in place who will overthrow elections that don't go their way. The Republicans have done or are doing all of these things.
That's not what he said. It doesn't matter which party wins. The issue would be if representatives of any party end democracy, which he outlined in short how it could be done - and some of the representatives of the "other party" have expressed real interest in performing those actions.