Article says "Jirzankal cemetery" -- on the banks of the Tashkurgan river in what's now Xinjiang province. I don't think that would be a Scythian area, that's more Pontic steppe, west and north from there. This is on the other side of the mountains.

But could be Tocharian, which were Indo-European speakers, an extinct lost branch of the language family that split off very early and lived in this region. (Read up on the Tarim mummies).

Or any number of Turkic tribes. Hard to know?