Does that study cover what their parents were worth before they decided to go into higher education or not? Some families can't afford for their kids to leave h

Does that study cover what their parents were worth before they decided to go into higher education or not? Some families can't afford for their kids to leave home —they might be carers, they might have jobs— even before you consider $100k of debt. If it's really just richer people in, richer people out, it's hardly surprising the median salaries are split. I'm not questioning whether or not higher education has value, not even if it presents a good ROI, but I am suspicious of numbers that present nothing but race as the "background", when that is such an important part of who goes into higher ed.