>>214234750
Absolute bollocks. There is this unverifiable hypothesis that their nobles intermarried with some Ainu warlords because they were really deft at combat, even though those tribes were totally outmatched by Yamato settlers and were at the developement level of Taiwanese aboriginals. Even if you buy into that nonsense, Ainu were a drop in the bucket compared to waves of migrants from the Mainland and also genetically closer to Samoyedic people of tundra.
Okinawa pesantry descendants can be considered a bit diverse genetically (and only a bit), because they had some long-standing Ryukyu ancestry, but they are, again, a miniscule drop and also Asian as hell.
There is a reason why majority of Japan Idols have mixed ancestry with other Asians – Japanese women in general are ugly.