To clarify, I object that any of these things matter much for general outcomes. If the article had immediately supported these claims, maybe I'd be more accepting, but as is it appears I'm supposed to have taken it as a given.

It's a pretty well-established fact that children of two-parent families have significantly better outcomes than those of single-parent families.

However, I'll concede its juxtaposition with overall whiteness and Spanish language fluency as additional metrics of population-level success are highly suspect, even if we grant that being a white, English-first speaker may contribute significantly to an individual's success (for reasons which include the unsavory).