Look at his numbers. 90% do not serve in underserved areas. That's the 9 in 10 you say isn't there.
Loren, there is some confusion here. Those initial numbers were mine and do not mean what you think. First, they meant something else and second they were about the Indian Health Service, not the broad concept of underserved areas. Second, within the same post I had also linked a study regarding underserved areas. That study has more relevant numbers to underserved areas. Underserved areas are divided into 3 types: low socio-economic, understaffed, and rural. There are acronyms for the 3 types, but I'll leave that out. There can be overlap between all three. In each of the 3 types across specialties Natives have quite a bit more frequency across specialty types. None of the NA proportions are anywhere near a lowly 10%. For example, for FamilyPractitioners/GeneralPractioners among the 3 types you have for NA proportions: 44.3%, 35.1%, 43.5%. If you add the numbers together you get above 100% and this is because there is some overlap between categories. That is one location can be in 1, 2, or 3 types. There is some dependency between the three and I used AI to answer what that dependency is with sometimes hard data and sometimes reasonable estimates and using the principle of inclusion-exclusion. It gives about 75% or a little less than that for NA working as a doctor at a location in at least 1 category. Now compare this to Asians with data from the same study across the 3 types: 17%, 6.5%, 25% and combined using AIs estimated way of computing the inclusion-exclusion, you get around 30%. Now, 75% is more than twice as much as 30%. If you don't trust the AI computation, there is still the hard data from the study which is still a significant difference.
All that is probably besides the point, because there can be considerable noise here in a discussion of small racial categories like American Indian, Alaska Native, Native Hawaiian, Pacific Islander. For example, there are only 33 matriculants this last cycle that were American Indian/Alaska Native. There were considerably less that were Native Hawaiian/Pacific Islander.
To add--as I mentioned long ago, different groups also apply to different schools at different rates that have different thresholds. For American Indian, there is a certain set of medical schools for which they are very likely to apply to and other demographics much less likely to apply to. Those also have a "fitness" for their stated mission. I will give an example: the Duluth campus medical school in Minnesota. They have a low MCAT threshold for entry. In interviews, essays, engagement, etc, they seek out individuals willing to work in tribal areas and rural areas. They are recognized across many years on special lists for producing doctors who work in rural areas (which are an underserved type). Other campus medical schools in Minnesota do not have the same mission and they also have a higher MCAT minimum. So, you can expect some self-selection going on here: students with a specific interest in the mission will want to attend, i.e. a higher frequency of White people and Native than other campuses. I believe I read somewhere they may have 3 NA this year which would be about 10% of the whole cohort.
Off the top of my head, I believe there are some other schools like this, perhaps in Oklahoma, North Dakota, and New Mexico, sorry New America. So for a good portion of these 33 people we are talking about merely a handful of schools with special missions and low MCAT minima.