Their ruling class were of Aryan admixture. The result is really three groups of people. One with a moderate admixture of Aryan. Another group with little or none. Likely because they were historically fuck toys of the ruling class. And finally another group which is basically their 'natives", with very little or none. Example, the people of Okinawa. Each group has distinct features and you can see the vestigial Aryan traits in some of their political class today. This is why they were considered honorary Aryans. This gets more complicated because genetic testing doesn't generally make the group distinctions. As the ruling class is the smallest, their admixture significance is somewhat pushed into noise because of the majority in the other groups. This is why some will sperg hard at the concept of Aryan admixture in Japan. Regardless, you'll find Scythian/Aryan (Adamites) and admixture made all of the ruling class and creators of civilization everywhere. This is why you find the swastikas everywhere. Even into antiquity and pre-flood.