The nasty bit was telling a mother she has to have an abortion against her will.
China now has the opposite problem of a declining population, which causes problems because of the working age population is small compared to the older population, you end up running out of money so you either have to tax more heavily or abandon older folks to their fate without helping them.
The declining population problem is very common in wealthier countries.
And lower population means fewer jobs. The number of jobs that need doing in a country doesn’t depend on the area of the land, it depends on the population size. The problems come when governments don’t build infrastructure. If you don’t build schools and hospitals and suchlike, three are fewer jobs in construction and less money going into the local economy, and schools and hospitals get crowded and do a worse job.
I think you’re quite a few decades out of date with that opinion. The Chinese government is very worried about population decline now.