That's true only in the minds of those who are too sexist and too racist to actually consider that a black woman might be the best person for the job. You don't have to continue to try to convince us of your views. We totally understand your reasoning.
BS. Biden was quite open and explicit about not considering any man for the position. The requirement that she be at least part black was not explicit (unlike with his DEI SCOTUS pick) but it became a de facto restriction after the George Floyd insurrection when honkeys like Amy "Mad Hatter" Klobuchar became untenable.
It is funny how the Left can at the same time be extremely supportive of DEI/affirmative action but at the same time also be adamant that it does not happen, and even that people who notice it happening are "too sexist and too racist".