Those are Velaryons, not Targaryens. Still, they should be white as they came from Valyria. Of all the families in HOTD, Velaryons are the easiest to make non-white. They are a seafaring family who could have intermixed with southern islanders.
It's easy to do this in a way that is logical but instead they will make it a $#its how like Bridgerton where they have a bunch of Blacks in pre-Victorian Britain whicu didn't make sense at all because it was not historically accurate.
OK, I stand corrected.
As long as it makes sense, that's all I ask. Thanks for the explanation.