Over {mumble} decades, I've been stereotyped as good uncle / father / grandfather / etc. material pretty often, based on how I reacted to or interacted with various kids.
I've also seen quite a few men react less well to young children, and had less-favorable stereotypes quickly applied to them.
I wonder how the men featured in the article were stereotyped when younger. Back when couples mostly got together in larger/richer social contexts (churches, tighter-knit communities, etc.) - having the young women hearing unflattering whispers (about a young man's parenting aptitude) could certainly dim his prospects for having children.