The problem being discussed is prejudice. Whether that prejudice comes from some nebulous idea of "race" or "culture" or something else is besides the point.
The hiring data from high tech companies is not broken down by culture, but by race.
They're saying that racial equality is the important bit, and if black people aren't equally represented then there's prejudice.
According to that logic, it doesn't matter what culture the person has, as long as they have African ancestry. It doesn't matter if they're part of a high achieving immigrant community, or a low achieving black american community.
