The fact that this article has been both condemned and lauded by white people, black people and a guy who's Jewish suggests that it's a bit more complex than this.
Human beings are psychologically predisposed to create 'us and them' mentality. This has been done along race lines, along national lines, along gender lines and along a whole bunch of other things throughout the course of human history.
It is only recently that we have started to accept that individuals carry the weighting of the group they puport to be from. Any given individual can weigh in and have the backing of their group identity. This group identity has then been supercharged by other people within the group to attempt to subvert all the other identities.
The result is a mess of conflicting individuals all representing their chosen group and all pulling in different directions under the banner of 'inclusion'. I have no doubt that racism, sexism and other isms exist - they have always existed, and they always will exist. They exist cross culturally because it's hard wired into our little primate brains to think that way.
By attempting to teach 'white people' how to think about race, you're going to fail. White people aren't homogenous. Nor are black people. Individual human beings can barely agree what constitutes racist behaviour, let alone try and sort it in any meaningful way. The best we can hope for is a greater amount of positive interaction and successful attempts at multiculturalism. It's a slow but steady process and one that's hampered by ham fisted attempts at equality and identity politics.