"Black" as used in the editorial above is a very specific usage - replacing "African American" for the critical reasons outlined. The reason this group is unique as an ethnicity w.r.t. recategorization is because the structure and violence of slavery isolated them from historic ethnicities and forcefully regrouped them under a new one. This is why in that Habecker paper, peoples with dark skin and african heritage who were not part of that system try to separate themselves from that identity - that's why it exists!
I'd also argue that "Asian" probably _shouldn't_ be capitalized, and there are some theorists who agree. Really, asian only really exists as an ethnic category because Americans historically (and even now) couldn't really be assed to learn the basic geography of Asia and grouped it all.