No clue who you are talking about, you are gonna have to provide a few more details.
As for the CRT stuff, I know there are some crazies and overreactions. I'm not for banning per se, but I am against giving it a preferred platform in education. I think this is actually what some of these "bannings" are; not that you can't think it or read about it, just that government paid educators are forbidden for presenting it as some kind of truth. CRT (at least from the definition I'm using) is philosophy. Bad philosophy. At a minimum, it is unsettled and therefor unsuitable to be taught as a curriculum. It can be taught as something that exists but then it needs to be given the treatment any such philosophy would get and I doubt e.g. High School educators have the background to even try that.
... it's a book. You want me to duplicate it in comments here? Any place selling the book will have a favourable summary. Any place critiquing it will have a negative one. If any actual philosopher bothers to discuss it, they won't be favourable to it at all.