The names you listed were, I assume, 7 white people and 1 black person. But, in light of the fact that African Americans make up 13%~ of the US population, wouldn't we expect these kinds of numbers? It reminds me of the Oscars So White movement, and how it's focus on Black americans has largely ignored the much greater disparity that exists in the Latino population.
Something is lost in these arguments when people want equal representation based upon the racial population of earth or based upon the history of modern media, rather than based upon the current population of the US, or the racial makeup of individuals that are actively searching for voice acting jobs. Actual data or statistics would be extremely helpful in this kind of situation, rather than how many actors we can name off the top of our head, if we want to see where inequality exists.