These numbers are grossly misleading. US population numbers are meaningless.

Harvard doesn't consider all US born students. They have an academic floor. Most of the US population does not meet the academic floor. Low achieving students are effectively not in the applicant pool even if they apply.

A more accurate representation of the applicant pool would be the USA demographics that meet the 10th percentile SAT score at Harvard. However, even with this more accurate pool, the accepted population would differ because different races have different average scores within this pool. The races with lower averages would be expected to be underrepresented in the accepted pool compared to the applicant pool.