Pay no attention to the man behind that great wall over there

Whether China makes emissions or not, it doesn't really matter when it comes to determining the net carbon emissions of a country (except China of course).

There are countries that have net-zero already, which the highest populated country that has net zero is Madagascar

https://www.weforum.org/agenda/2022/12/these-countries-achieved-net-zero-emissions/
https://www.worldometers.info/world-population/madagascar-population/