The bias you are looking for here is survivorship bias. Minorities have to outperform their majority-peers or they don't get hired or promoted. So those that remain are disproportionately skilled.
But my concern is the narrative fallacy - we ascribe far more importance to narratives than they deserve. The way to defeat that is to fill our narratives with the future that we want rather than the future that we don't want.
Seeing any correlation of ability, skill level, or talent with some shared physical feature is more often than not confirmation bias.