I don't think we're qualified to answer this last set of questions.

We're qualified to inquire into any topic that seems worthy of curiosity.

There seems to be much convergent evidence that people who self-identify as "black" tend to test more poorly on some standard measures of cognitive ability than do people who self-identify as "white", and I don't think acknowledging that makes someone racist.

I'm in violent agreement with you that a) self-identification as a member of some ethnic group is a cultural phenomenon, not obviously related to any "natural kinds" or empirical clusters, b) standard measures of cognitive ability are a very poor proxy for what we may generally think of as "competencies", whereby individual humans contribute value to the world, c) it's unclear even if the 'genetic' claim were established as fact what influence it should have on social policies.

If we think about a) clearly enough we might be able to dissolve the confusing term "race" and that seems perhaps a worthy goal. If we think about b) clearly we might be able to dissolve the confusing term "intelligence" and its cortege of mysterious questions, and if we think about c) clearly enough the mysterious questions of ethics.

Isn't that what this site has been about all along?