I don't know if that's true or not, or maybe they didn't register in a Chinese marriage registration office so in China's eyes they are not legally married. China is an open society, you can marry whoever you like regardless of their backgrounds or nationalities.
Where is the video? or a link at least . it sounds very un Chinese, Chinese mostly are law abiding fellows with little tendency of violence.
Are you telling me you can tell the difference between a Han Chinese, a Japanese, a Korean and a Uighur by video?
Pakistan doesn't have koreans, uighurs, or japanese working on the damn projects.