The author's main point is that racism manifests not just as the (probably unconcious) belief that black people are inferior, but also in the (definitely unconcious) assumption that they are all the same. I'd heard about the CV study before, but not its most interesting finding (which supports the author's point): that the rate of responses for "high quality" CVs with "black names" was just as low as for "low quality" CVs with such names.

This is the thing missing in the violent debate about studies showing that black people have a lower average IQ: even if it's true, any specific individual (or even specific sub-group) may still have a very high IQ and deserve respect and success just as much as a non-black person with such a high IQ.