How can it be known with certainty that a group will be diverse, and thus have the benefits of diversity, simply by using race as a datapoint? Is every individ

How can it be known with certainty that a group will be diverse, and thus have the benefits of diversity, simply by using race as a datapoint? Is every individual of a particular race innately imbued with some magical ability or perspective? What if you have a Chinese father and a Russian mother and you grew up in Kenya?