I don't think there's a good discussion to be had about this article. The referenced paper is based on two data sources. One is a longitudinal study (great!) of "hundreds" of children in one region (not bad!) and only checks parenthood at the rather young age of 23-24 (uhhh). The other study is based on Mechanical Turk questions. In both the article and the fullest version of the paper I can find online [1], no further details are provided -- not the size of the effects, not the statistical power, nothing.
[1] https://psycnet.apa.org/doiLanding?doi=10.1037%2Febs0000374