Why do you have to have the status of a third country to apply for investment immigration in Hong Kong?

According to the investment plan of capital immigrants, Chengda immigrants explained that China people and domestic residents must have the status of a third country, that is, permanent residency and residency in other countries, before they can apply for investment in Hong Kong.

Because, according to the principle of "one country, two systems", Hong Kong is also a part of China, so the residents who moved to Hong Kong from China and China are still strictly within one country and cannot be considered as immigrants. In order to avoid this political statement, the Kong Xianghong government requires residents with foreign status to apply for immigration to Kong Xianghong as applicants. China residents applying for immigration to Hong Kong mainly apply in the name of a third country.