Can permanent residents of the United States and Hong Kong live in Chinese mainland for a long time?

If a permanent resident of the United States stays in China for a long time, he will be judged to have insufficient immigration tendency and his green card will be revoked. In this case, he usually needs to apply for a White Paper (AP's) to maintain his green card status. Since he is a citizen of China with a green card status, it is no problem for China to stay in China for a long time. It is not necessary for Hong Kong.

I don't understand on the first floor. Once I am naturalized (that is, after naturalization), I am not subject to this restriction. Therefore, many "immigrants" in Canada still "return to China for development" after completing "immigration supervision". That's what "immigration supervision" means. Canadian maple leaf card holders can't.