How is it racist to acknowledge that if there weren't races there wouldn't be racism? That seems so self-evident it isn't worth commenting on.
The wording in the article seems to place the blame squarely on the appearance of white skin color.
Ethnic hatred (which is what is usually meant by the usually-inaccurate term "racism") doesn't require differences in pigmentation.
But what they said was that when races began, it was "one of humanities greatest sources of strife." Yet most African countries today that are 99% black are plagued with strife. Much more so than American cities that are of mixed race.