This is news to be breathlessly pronounced by the NY Times as a shocking new discovery? This has been documented billions of times. As far back as The Bell Curve they dissected IQ scores and school performance. IIRC, the poorest quintile of whites outperformed the wealthiest quintile of blacks by one standard deviation. Check my numbers, but they won’t be far off.
The generational poor, those who were born on the welfare plantation to those who had been born on the welfare plantation, then go on to breed with people on the welfare planation.
It is not a recipe for genetic success. Nor is this, relatively speaking, a very large gene pool, compared to those who grow up and go out into the world and find a mate from among the MANY socieconomic strata in our culture.
If it’s mostly the dim who stay behind generation after generation, and together produce the next generation, there’s not much chance for improvement. Then add in that the children are not raised well, the intelligence cost of substance abuse among parents and eventually kids, this means that their natural potential is not encouraged either.