The author takes a drastic misunderstanding of the operating model of BLM, which is largely decentralized, and uses it to attribute degenerative philosophical characteristics to a group of people all banded together on a loose set of shared goals -- primarily stopping racial violence instigated by police, a problem which cannot be denied in the US.
Kendi's work is extremely good, very provocative, and also long enough that I doubt a single person can succinctly summarize it -- let alone refute it through the words of someone else in a mere paragraph.
I suppose "consider the source" is at play here. From what I can tell, this site is nothing but the blogosphere version of some garbage neocon beltway think tank.