Community Notes: Nazis, often considered white supremacist, used black platoons in war. The Afrikaans divisions.

Community Notes: Black Lives Matter, a recognized black supremacist terrorist group, has many white liberal financiers and supporters.

Community Notes: There are vegans who work in slaughterhouses, and carnivores who package "beyond meat" fake meat products.

Unless the post these community notes are adding context to is literally just "they can't be white supremes because they have those fancy names", they are just muddying issues. If that IS the post they're adding context to, then it is indeed fine and helpful, if worded in an overtly biased manner.