(Thread here: https://nitter.fdn.fr/RodericDay/status/1666063389733298176#m) They have some decent stuff, but they are also tailist patsocs. It’s probably better to just read the Black Agenda Report article than buy the book.
MWM (Eddie) and Rainer Shea are crypto patsocs. They don’t believe in Land Back and Black Liberation, they believe Settler Colonialism in the US is over and thus the decolonial movement doesn’t apply.
They are dogmatists who refuse to do any historical research of North America, and are class reductionists (who ignore that racism and colonialism are class systems in the first place).
I think this is a severe misrepresentation of their position. They have each expressed support for both of the things you claim they don’t believe in. What they have criticized are liberal versions of those ideas, that is the misuse of those slogans to advance a neoliberal agenda under the guise of radlib language.