I feel like only the last paragraph was relevant here - I don’t particularly care why he wants a doctor of race X instead of Y. My question remains the same: why not just… get a doctor with the skin color you prefer? You’re not exactly assigned one for life at birth.
I think you're bringing up a different (very related) point than him, with both points having truth:
1. You're free to pick the race of your doctor. Matching your race is a data driven positive.
2. 30 years ago, the system made sure a minority doctor was (at least, but probably more so do to discrimination) as competent as a white doctor. These days, the system is intentionally and deliberately set up so to help pass less competent minority students, due to the positives of #1.
It's a mushy relative thing.