Nevertheless, without using prior information about the origins of individuals, we identified six main genetic clusters, five of which correspond to major geographic regions, and subclusters that often correspond to individual populations.
That is, what reasonable, sentient humans think of as races. This was something Gould and his ilk argued against for years. You must understand in your biased little brain that the left does not ever try to be consistent--it is perfectly logical (for them, and you, I suppose) to argue against the existence of race, but believe in the legitimacy of affirmative action for "groups" or whatever.