It's one way to look at it, but I think he's wrong.
My theory is that moderate Dems do have beliefs (in fact, its impossible for anyone not to have them) but they've been driven underground by the Woke Wing of the party. The Woke religion shames people for heretical views, and wants to cast them out in the name of purity. So, for example, it used to be a leftist position to champion an ever improving color-blind society. I think most moderate Dems would embrace that. But the Woke position is that color blindness is impossible, not desired, or actually a form of, or rhetoric of, racism. Sane moderates are scared to be called out, confused, and disaffected by stuff like this.