Pay attention to 9 and 10:
9 says that race isn't biological, but racism is real. Is race biological? No, if we mean biological in the natural kind sense of the term. Races are neither like species nor like different breeds of cats or dogs since the people who normally fall under our race terms (e.g. Caucasian, black, etc.) have no significant genetic dissimilarity; for instance, one is likely to find more genetic similarity between some who we call "black" and "hispanic" than between some who we call "black" and others who we call "black." This leaves open whether races are (a) unreal (that is, there is nothing which our race terms and ideas refer to), or are (b) real but not natural kinds; instead they are social kinds (like citizens or bankers) perhaps partly grounded in phenotypical features, or (c) some other thing altogether.
According to 9, race isn't grounded in phenotypical features at all; rather race is simply an idea. And there seems to be nothing to which the idea of race refers. Moreover it's an idea which privileges whites. How? In what way? No examples are given. But these advantages are there, even if we aren't aware of it. (Trust us. They. Are. There.) Presumably, though, these advantages do not exist in the form of affirmative action programs!
According to 10, we shouldn't presume that race doesn't exist. What does this mean? If 9 is correct, race is only an idea--and nothing whatsoever is mentioned about any extra-mental reality to which our idea refers. Blacks and whites are like unicorns and centaurs. Still, racism is real. Even though there are no blacks to which our idea of race refers, a Klansman can still be a racist. Racism is real, but race is an idea. Got that?
Still, we need the idea of race. Why? 10 tells us. So that we can have social policies and institutional practices that advantage some groups (non-whites) over others (whites). In other words, even though the idea of a particular race does not refer to anything in the world--it's a mental fiction--we need to pretend there are extra-mental races, so that people like Al Sharpton, race studies professors, diversity officers, etc. have employment and can privilege some over others--in the name, of course, of remedying alleged advantages given to whites by institutions and policies. Ignoring race as the (alleged) fiction that it is would have the undesirable result that affirmative action policies and institutions go out of business.
One wonders, if colorblindness would not end racism, what would?