> But the economic disparity is the reason for the racial disparity, because otherwise we expect people of different races are equally intelligent, right? So the economic disparity is the real one and accounting for that inherently accounts for the racial disparity as well, and you don't need both.

That's only true if you assume prejudices like racism and sexism don't exist anymore, but they do. Even today, these are the lived experiences of many people in society. As examples, there are black people who don't get jobs because they are just assumed to be worse candidates, even when they are more qualified and put in more work. There are women who don't get jobs because they are just assumed to be worse candidates, and so on.

These are real implicit biases, and they don't go away by just ignoring them.

Yes but what prejudices we accept and which we do not is arbitrary. You have no choice over your height. Taller people can have more promotions and more dating opportunities, but we don't have affirmative action for short people, and we don't treat women who say they don't date short guys like we treat women who say they won't date black guys. There's always going to be discrimination, what form of discrimination is acceptable or unacceptable is still arbitrary.