I'm middle aged and it's been over a decade since I listened to the radio, but I've been listening to long form talk audio for longer than that.
And there was a big buy right before COVID too, IIRC, so I expect more than half of them are now under the influence. But the programming can't slowly move left because the stations don't control it anymore. It would have to be a hard flip now. And a hard flip will get noticed.