I think a big issue with DiAngelo, and the pantheon of Anti-Racism HR manuals is that their core contention is racial essentialism. We get into a bizarre territory where their core claims if one really follows that logic can also justify segregation; after all, if say one category of humans is permanently spiritually contaminated by racism; there are only three options one has from that position. Option one is the one Robin DiAngelo likes, which is to pay Robin DiAngelo to remove your Racism-Thetans, or momentarily suppress them, Option two is full segregation so Black people need not suffer anymore office place microaggressions, or Option three we stay together and black people just learn to deal with it.
The book, as is all the HR Diversity Industry books, follow a particular world view, basically telling bosses that their workforce is infected with racist-thetans and that only by paying professional credentialled experts in Anti-Racism can these thetans be fought off for a while. Racism becomes all-important, but also purely individual spiritual battlefield with facilitating high paid corporate consultants to help you manage a personal spiritual corruption.
Basically, if you want to deal with racism, Touré Reed and his father Adolph Reed are a better benchmark to follow than HR Diversity hucksters.
Kendi, Coates, Wise, DiAngelo, Elliot, Krenshaw, all have a vision of racism and how to deal with it that doesn't involve actually resolving anything, their view is essentially the view the necessitates them being employed forever and sustains the industry they have helped to create. Touré Reed, I buy into far more intensely for dealing with racism because you know, he isn't trying to offer a case for the continued existence of a multi-billion dollar consultancy industry he happens to belong to, DiAngelo is trying to sell you her services, Reed is not.