As I understand it, it’s not anti-MAGA per se – the people who are abandoning Jordan are the ones up for reelection in districts where Biden won in 2020, and are therefor in most danger of losing their seats next year.
In other words, they are moving leftwards in a craven effort to be reelected, as opposed to following their ideology.
What’s going to happen is that eventually some republican is going to realize that she/he needs democratic help.