The real story here seems less about race and more about how the CS program at Howard was mediocre (or at least didn't produce students that met Google's expectations) and one of the professors with a background of working for Google and attending an elite CS program realized it's deficiencies, improved it, and was able to get a bunch of students hired by Google by filling in their knowledge and experience gaps.
The school happens to be historically black but I'd be surprised if you found hiring statistics from a majority white school with a similarly ranked CS program to be substantially different.
The school happens to be historically black but I'd be surprised if you found hiring statistics from a majority white school with a similarly ranked CS program to be substantially different.