I ran a Clubhouse last night on Nepalese genetics. I said something to the effect that most Nepalese Brahmins have Tibetan admixture. A Nepalese Brahmin came up on stage to tell me this was inaccurate, and that they did not intermarry with native people.
To give the benefit of the doubt I went back and double-checked, and Toward a more uniform sampling of human genetic diversity: A survey of worldwide populations by high-density genotyping, which has a diverse set of Nepalese. What you see on the PCA is pretty straightforward. Except for the Madeshi, who is presumed to descend from recent migrants from India, all the Nepalese are Tibetan shifted.
The rank order is what you’d expect, with the Magar being mostly Tibetan, and the Brahmins being mostly non-Tibetan. But the Nepalese guy was totally full of shit. I’m sick of listening to people contradict genetics when it’s so clear.