Earlier quoted context omitted.
> It's known that genetically the Japanese population was seeded by Korean settlers which largely displaced the native Ainu populations It's even more complicated than that. In addition to the Ainu there were the Jomon people, a non-agricultural but nonetheless settled society who are believed to be the first people in the world to use pottery - which is surprising for a non-agricultural people. They might in turn ha…
I thought the latest thinking was that the modern day Ainu are descendants of the Jomon population.
This pattern - early hunter gatherer populations forming the substratum that later mixed with larger migrations of agricultural populations - is not unique to Japan.
It's quite similar to what you find in the paleogenetics and history of most regions of the world, including Europe and South Asia.