Since they don't make up 50% of the pipeline the enforced restriction necessitates hiring further down the ability rank even if you are to assume that all races

Since they don't make up 50% of the pipeline the enforced restriction necessitates hiring further down the ability rank even if you are to assume that all races and all sexes have the same ability / aptitude. And it also means for every non-minority male you need a minority female and those are very hard to get.