That said while I haven't read the DiAngelo book the scenario I imagine for situations like this is generally not someone waking up and saying I will write something to get some money out of these people but rather I will write something about this situation, later getting offers of more and more money and then behaviorism takes control of the journey.
It is difficult to get someone to change what they're doing once they start getting paid for doing it.
This is of course all separate from whether I might agree with the book if I read it. I can still agree 100% with someone and think that their perspective is constrained by how they have begun to profit from it.