Yes, pg succumbs to the anecdotal fallacy with his conclusion here. He is filthy rich. When someone who’s filthy rich has kids, I’d expect a bimodal outcome: outsource child raising entirely and keep on working hard (lousy father scenario) or take it relatively easy to spend time with the kids.
When someone has kids who is not filthy rich (ie most people), I think the outcome has more variance. Some will have a hard time adjusting, some will decide that money and work aren’t very important, and some will become more ambitious in order to provide for the family. Also, the outcome can change over time. The shock to the system of the early years can be replaced by naked ambition as the kids get older and college looms. Etc. One thing I enjoy about working with people with kids is that they generally seem more discerning about what to spend time on at work, and they have a good sense of rudimentary people management skills.