Your link is racist because it promote one race over another. History, is written by the winner and is bias so as science discoveries, etc...
Not long ago the Nazi labeled the Jews as untermensch, apartheid South Africa sees blacks as kaffirs (infidels), British whites considered Indians and African are slave, Australian whites considered themselves as the master race over that of the bushman, and European whites considered themselves to be superior over that of the American Native.
IMHO, given the same education, living condition, and opportunities since birth, people with out birth defects or drug/alcohol birth then it is likely that all would performs equally.