Oh please! I see this everywhere and I don't believe it.
Norway and Sweden had their "demographic Armageddons" in the early 1800s.
Governments took notice and decided to suck less.
Population rebounded as workers could afford children without emigrating to the USA first.
David Ricardo wrote a good economic analysis of the effect of economic conditions on willingness to marry even earlier.
Now the CCP has a lot of practice in being terrible, but a declining population and economy is just the thing to inspire reexamination