Reversing demographic momentum isn’t so easy. You have a cascade effect which happens, and high costs of a massive elderly population can’t be borne by a sudden baby boom. Also, through the medical system, etc, you can force people to abort their children, but it’s harder to force them to make children.
And that's more of the "propaganda narrative" (google that term) getting pounded at us from all channels over the past several years. It's so 1984 - remember when we were told they were growing too much and getting overpopulated and the planet was going extent any moment? So which one is it? Anyways, their population decrease will be offset by AI and automation all while they still pump out more honor students than the entire West combined. They'll be fine is what I'm saying.