that article is just a theory only.

however origin of japanese do comes from china, else why you think japanese and chinese look alike that much?

actually all japanese tradition and festivals are come from china, you can investigate ancient chinese apparels and festivals and compare with japanese one.

but chinese never say they are more supreme because japanese ancestor comes from china. history is history. they are now 2 different nations already.

A 2008 study about genome-wide SNPs of East Asians by Chao Tian et al. reported that Japanese, Koreans and Han Chinese are far from southeast Asians, and Japanese is related to Koreans who are related to Han Chinese, but Japanese is relatively far from Han Chinese if compared to Koreans