Despite the colorist's odd choice, it's clear to me that the way artist Deryl Skelton drew ben Zoma's features in that issue is not consistent with a "black" ethnicity. His hair is straight (or slightly wavy) rather than tightly curled, which is kind of a dead giveaway.
Well, you can't marginalize or generalize all black men.
Some of us black men do wear our hair "wavy" as a style. The aforementioned, Billy Dee Williams still does to this day, as do other black male actors. Not too mention the mixed-race black individuals (be they half-Asian, half-Caucasian, half-Latino, etc.) who will gain certain features from both parents.
It's fair to note that not all black men have tightly curled hair, but it's completely unfair to Christopher
to accuse him of trying to marginalize anyone. He's having a difference of opinion about what the creative intent was in the depiction of a character, not trying to perpetuate the oppression of African Americans.