The Arabs have always been a historically light brown-dark skinned people, no shyt sherlock. I'm saying that the general perception of a black African, in that region at the time, was that of a slave. This has carried over into modern times where "abeed" is used as a slur by Arabs for black Africans living in the Arab world. Why don't they apply that slur to to other races? None of this is by accident, you should stop fooling yourself. That link you posted is jumping through all kinds of hoops just to make a credible claim that the Prophet was dark skinned....I mean, what is the point?
Hadeeth's describe the Prophet was being light skinned, with wavy black hair that fell to his shoulders, long eyelashes, black eyes, a UNIBROW, and a thick black beard. Sounds like an Arab to me.