It does bear pointing out that the article appears to be addressing a very early stage of human evolution, in fact so early that the applicability of the word "human" is debatable. The argument is that skin colour was probably light in some ancestral species that lived in the forest and retained extensive, ape-like body hair. Subsequently, body hair would have been reduced and skin colour would have darkened as these proto-humans moved onto the savanna and continued to evolve under different conditions.
All this happened well before the emergence of our modern species, Homo sapiens, and it's still a good bet that the earliest members of our species had relatively dark skin. As I've said before on these forums, however, this has absolutely nothing to do with any meaningful concept of "supremacy", except in the trivial sense that dark skin was more suitable for the environment and way of life of early members of Homo sapiens than light skin would have been.