Did the ancestors of the Japanese come from China?

Anthropological research results show that:

The ancestors of the Japanese should be a mixture of the Mongolian Xianbei people in East Asia, the primitive hominids in the Japanese archipelago, and the Malay blacks in the Philippines and Indonesia. After many changes in history, especially immigrants from Chinese mainland and the Korean Peninsula, the Japanese bloodline has changed again. European and American elements have been added to the bloodline of modern Japanese, especially more and more Eurasian and American-Asian hybrids. Therefore, the Japanese should be a "hybrid" species in terms of origin and migration history.