What you fail to understand is that the method for getting rid of racism in admissions decisions is to actually look at race.
Only willfully blind racists think that anything can ever be race blind. Because reality is not.
Another misconception that racists spread is that minorities who benefit from affirmative action are somehow not otherwise deserving. The reality is that you still need the grades (or money) to get in to the university. All that is different is that universities are rewarded (read as not sued) for having racist admissions. i.e. being an all white school in a state with a large minority population. Which was a real thing in the deep south into the late 1970s.
What racists also ignore is that having a mixed student population is actually good for the student body as a whole.