Mir's overall thesis about trump not getting any more voters is absolutely right. It's a constantly shrinking base, either by his machinations, or by the grim reaper.
Now whether Cowherd is the right bell weather for that is obviously whatever, but it absolutely leads to Biden needs people who want to vote for him to vote for him. Trump is getting his, but he's also not getting any more.
Also ftr, I do think Trump's loss in people between 2016 to 2020 is going to be way greater than 2020 to 2024. I think 2016 was big dice roll for a lot of people and they just said eff it and went with trump. His total lack of doing anything, let alone unnecessarily antagonizing a not great situation with COVID, and then his whole turn off the lights get called for it ok fine let me do a supremely tone def blast protesters for a photo op did him in.
I just don't know if January 6th, the convictions, et al have eroded his base even more. Maybe, but I don't know if appreciable compared to the dice rollers he lost in 2020, who I assume for the most part are going full apathetic this time.