Sociology departments in America are captured by the current moral fashion (identity politics). If it were me, I'd think twice before believing the research that you linked to.
If it is moral fashion to acknowledge and measure the obvious racial and economic discrimination in America then that’s a fashion which is morally good.
That is assuming that the moral fashion is actually doing that. Unfortunately, the moral fashion is more about starting with a predefined set of conclusions, then working backwards to justify those conclusions. I don't think we need to sell out our integrity to achieve a better society, or make false equivalence between liberal social justice and critical social justice, of which the latter is the current moral fashion.
It is actively harmful if they're measuring the wrong things and in the wrong way to come to an exact predefined conclusion instead of the one that is actually maximally good for children.
Hard not to when antisocial policies are intentionally used to disadvantage minorities after the 60s.
We might agree they're focused on a symptom, not a disease, but conservative policy objectives are definitely causing disparities that now even poor white people are finally feeling.
Conservatives shut down public pools in reaction to integration and then proceeded to shut down socialism.