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Very interesting study in ancient history of man. but the title confusing and article conclusion too. " They seem to be solely related to hunter-gatherers who lived in southern Siberia and what is now northern Kazakhstan some 9,000 years ago," So their genetic studies do show them to be not native, and could have possibly brought in their technology.
The point is not that all their ancestors were native to that particular spot in central Asia, but more that they were members of the central Asian ethnic group rather than an ethnic group from further west, closer to the origins of agriculture and the technologies behind some of their material culture.

So this is about the dissemination and transfer of technology between ethnic groups more than it's about geography. By native they mean central Asia, not the Tarim Basin.