At least the values you get if you search google says it is at 1.412 billion and growing at 0.1% as of 2021 (not negative).  Forecast that it might drop to 1.31 billion by 2050, so the slowing growth is likely to continue.  India is very close to it at 1.408 billion, so highly likely to surpass it.

> The one-child policy is long-gone, but nobody is having kids and nobody's moving there.

Yeah you don't hear of too many people moving there.

My cousin's daughter moved there recently to study and live with her boyfriend there.  I wonder how she will find life there.  She is in Hangzhou.

It does sound like setting up companies in China is not trivial and you
don't actually get to fully be in control.

Well it will be interesting to see what happens.  It may not be good, but definitely interesting.