Ok, well if you look at your chart going backwards you’ll see the distinct differences. Is a Norwegian in the negroid group? Is an Australian Aboriginal in the Mongolian group?
A Sicilian has less genetic distance between himself and a Japanese person than either has with a Thai person.
You want to lump Japanese people and Thai together, but that is not based upon any objective standard, but upon superficial similarities.
If you want to go 3 races they would be...
1) New Guinean/Australian
2) Asian/Caucasian
3) African
If you want to go further down the chart you can also get 5, and they would be....
1) New Guinean/Australian
2) African
3) Indians/Middle Eastern/European/etc
4) Korean/Japanese/Siberian/American-Indian/etc
5) Thai/Polynesian/Philippine/etc
There are distinct differences, that is not at all under debate; just how you can possibly get three, and where you would put New Guinean/Australians?