That said, I don't think talking about gender imbalance in software development takes away from discussing racial imbalance in software development.
And I do think underrepresentation is an issue on all sides. In my career so far, I think I've met a total of 5 black programmers. The fact that I can remember the exact number is a problem, because I definitely can't, and don't, keep track of the number of asian/latin/etc. programmers. But meeting somebody black in tech is so rare, it always stands out.
So yes, it is a concern. But they are all valid concerns. And talking about women doesn't take away from talking about blacks. All are valid issues.