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> TBH I wouldn't expect Xinjiang mummies to be of Indo-European origin, given that Xinjiang is in east Asia.

Apart from the other comment pointing to the Tocharians of Tarim Basin who were Indo-Europeans, the only thing the classification Indo-European means that the language they spoke had Proto-Indo-European as a common ancestor. Even right now there's an Indo-European language right across Xinjiang's border - Tajik. This wouldn't have been anything out of the ordinary.