Earlier quoted context omitted.
what they're trying to convey is that certain phenotypes have correlations to an overly broad construct, and with your example it is only showing that certain debilitating evolutionary paths are correlated or exclusively within a subset of people with those phenotypes not that hard, to me, let me know when you get there though
You're being unnecessarily condescending when my comment was sincere and inviting of new information. I'm not really sure what you intended to accomplish with that last line, except making yourself feel superior to a stranger online who hasn't read some book or taken some class you have?
its not supposed to be new information, its supposed to deconstruct that people in the largest continent on the planet have the most genetic diversity and only chose/were forced to group together for shared representation after noticing they all got a shitty parallel experience in some other continents
the same concept applies to other groups that happen to overlap in some unique phenotypes