One of the sources: https://journals.plos.org/plosone/article?id=10.1371/journal...

>> This finding implies that individuals with genetic predispositions for an earlier AFB had a reproductive advantage and that natural selection operated not only in historical, but also in contemporary populations. The observed postponement in the AFB across the past century in Europe contrasts with these findings, suggesting an evolutionary override by environmental effects and underscoring that evolutionary predictions in modern human societies are not straight forward. <<

Yeah, so basically we got a simple model by two economists vs. decades of empirical data?

It'd be funny if it wouldn't sound like a scientists version of the "immigrants will have a lot of children and replace us" lie.