"China's Articles 50 and 89 (12) of the People's Republic of China Constitution
Articles 50 and 89 (12) of the People's Republic of China Constitution enshrines the Law of Return for ALL ethnic Chinese who have emigrated abroad, even those who did so before the proclamation of the Republic, and covers ALL their descendants born in other countries and holding other nationalities and who have never stepped foot in China before. In the unlikely event that a definable community of ethnic Chinese outside China is threatened with racial violence or genocide, China would provide all assistance to the oppressed community, whether in the form of diplomatic pressure, economic sanctions, or limited military action to secure the safety and effect the evacuation of the said community whose members are all welcomed to return to China to settle there as full citizens with special constitutional privileges granted only to returnees. China's Law of Return.
May I ask for the link to the source of this translation, please?

And it MUST be an official document from the government of the PRC.
Otherwise, your post seems to be the ORIGINAL source for the following threads in two of the most popular online forums in Singapore and Malaysia:
forums.fuckwarezone.com.sg/eat-drink-man-woman-16/good-news-sinkies-chinese-can-emigrate-back-china-5197230.html
forum.lowyat.net/topic/3734908/all
The only official translation I could find for Articles 50 and 89 (12) of the PRC Constitution is:
CONSTITUTION OF THE PEOPLE'S REPUBLIC OF CHINA
en.people.cn/constitution/constitution.html
Article 50. The People's Republic of China protects the legitimate rights and interests of Chinese nationals residing abroad and protects the lawful rights and interests of returned overseas Chinese and of the family members of Chinese nationals residing abroad.
Article 89. The State Council exercises the following functions and powers:
(12) To protect the legitimate rights and interests of Chinese nationals residing abroad and protect the lawful rights and interests of returned overseas Chinese and of the family members of Chinese nationals residing abroad.
It clearly says "Chinese nationals" (meaning citizens of the PRC) and does NOT say anything about "ALL ETHNIC CHINESE" (let alone their descendants) who emigrated from China before 1949 when Mainland China started to be governed by the Communist Party of China.