This is the mindset that caused the rise of the far right. People like this have their heads so far up their asses that they can't see the problems in their own land and need to meddle in others.
Perhaps because regardless of some policies targeting the economics/material issues of having kids that some countries have put in place (Russia, Hungary, S. Korea, etc.), those policies don't change the brutal cultural situations in those countries: 2 authoritarian regimes + extreme competitiveness of S. Korea.
It seems like the neoliberal era growth model has long since broken down, and our politics haven't adapted with deeper reforms to reflect the latest technologies, etc. that could produce more material abundance than today (see: China's rise).
As a left accelerationist, I can't help but think that a society with a 4 day week, no precarity, cheap access to good housing, healthcare, education, etc. would increase the social trust and the birth rate, as most people want kids and want them to grow up in a thriving society.
Having kids is expensive and for many people of reproductive age there's the additional concern of bringing a child into a world in crisis. I believe that all these problems are technically solvable but are not politically palatable.
The simplest thing that we could do would be to subsidize childcare so that the biggest economic hurdle would be addressed. But again, that would be dismissed as socialism and would be a non-starter today.