That is correct. Chinese authorities require that at least one parent remain in the country to complete the process. In some countries, that is not necessary, while in others, they insist that the parents to live there for a few months or even a few years in some cases.
Evidence of meeting #38 for Citizenship and Immigration in the 40th Parliament, 3rd Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was naturalization.
A recording is available from Parliament.