I know, they are distinct from the Chinese migration that interbred and today makes up modern Japan. I have never seen anything about Ainu's looking anything close to European genetic stock. Rh- blood perhaps, but you are looking at an entirely different timespan imo if you are claiming the groups are linked. This is not something I have explored but you can see images of native Ainu's and compare to lighter skin Brahmin caste, as well as do genetic profiles, and in one case we see European adjacent profiles and the other not so much, unless you are getting into Denisovan/Sapien territory.
The Vikings that made it to Minnesota by 1050AD
The equivalent of 999999999999999999 miles
The Vikings that made it to India were the same Vikings.
There are very few gene pools that weren't raped and pillaged by the Vikings.