I see many assumptions in this quote that are very telling to your thought processes and leading you to inaccurate conclusions. There is more involved in classifying a species than the shape of the body and the color. Taxonomy is a science. There is an evaluation of functional traits, genetics and breeding capabilities. This is also the reason species and genus classifications are constantly evolving.
If you think species classification is as simple as you imply in your quote, I can see why you would come to the conclusion that humans could be classified as different species. There is a reason humans are all classified as the same species though, they meet all the scientific classification criteria.
Based on genetic similarity, breeding capability and functional traits, what makes you think that skin color alone would necessitate humans being broken up into subspecies?