I suspect the mechanism they will cite is that white parents create segregation, which is bad because the black kids cannot go to school with white kids and therefore cannot benefit from positive peer effects.
Democrats have been running big city schools for thirty years or more....
Black do fine in smaller towns with good schools...and a parent who makes sure they do the work...
You can teach any kid to read if you start when they can setup...my kids were reading at three and four years old...
We had a foster girl who was reading at four years and started at two years..