A lot of people right here support his point...the SCOTUS pick did it.
I think this makes sense - the line in the sand drawn by McConnell made this election, for many conservatives, all about preserving the balance of the Court. While this politicization no doubt inspired some Dems to get to the polls, for the Dems the Court wasn't the life or death issue it was for conservatives, because conservatives were facing an existential loss.
The NeverTrumps mostly came home to the GOP on election day. I have to think that the SCOTUS was a big reason for that.