I do not buy her purely speculative reasoning for why single dads produce better results for their children than single mothers. My speculative reason is that men who undertake to raise children by themselves are better individuals, than women who deliberately estrange their children’s fathers.
I knew a couple who had a child, I do not know if they were ever married, but they were not when I met them. The mother was the colored lady from HR Hell. Not a crack-whore, just an unpleasant and demanding colored-lady. The father was a “regular-guy” white hardware store owner. The father was a much better and more caring parent, and fortunately the child lived with the father. He build a pair of adjacent homes for himself and his mother, who was sort of a live-not-in-but-next-door babysitter.
A buddy of mine ended up being a single dad due to a divorce.
He raised an autistic son and a couple of girls.
The kids had their bumps along the road, but they all turned out well especially the autistic son.