When you think about it, this isn't REALLY new news.
BW have been observing since at least the 80s that there aren't as many upwardly mobile bm as black women.
BW have known since at least the nineties that there aren't as many bm as there are bw, period.
BW have been observing since at least the 80s that bm are more likely to marry out, especially the upwardly mobile ones.
BW responded to that by a)doubling down and competing to be chosen by those upper income bm who would date and possibly marry them, b)marrying down and c)choosing to remain single. Some of those women remained single and childless and some of those took the consolation prize of at least having a child
BW have watched their never-married status and their oow rate rise precipitously over the past few decades with relatively little fuss. (Made a huge stink about that baby-carrier packaging though)
The obvious result is that
a) bw have a lower household income than if they had a partner at or above their level, and this means that higher-earning bw do not reap the same benefits of personal advancement that other women do
b) this is compounded if they must also support children on this income.
b.1 multiply the issue if they must support children the bm brings to the marriage/relationship (Jill Scott)
c) given how often bw support extended family members, the income must further stretch, leaving less for her own children, household expenses, savings etc.
Conclusion: BW who make the class jump are (overall) held back when they partner (marriage or not) with bm.
BW overall have decided that it's better to mate with bm for decades. I really don't see how this one study, which simply distills what we already know, would or could change that.