North Africans did, right. But we're talking about black Africans.
Tbh the whole thing depends on what the character is trying to portray. If it tries to portray everyday normal Ancient Greek, yeah that's an issue. If it is meant to be someone from Ethiopia, something like that, yeah no issues.
Unless the trailer shows what they're portraying (and imu the movie isn't even out yet) then the complaints are premature.