Ygorcs
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Bronze Age Anatolians don't have EHG ancestry, both they and the Steppe people have CHG/Iran_N ancestry, that's where they intersect. if it was some other language group we would follow this line of reason, why are Indo-European languages an exception ?
Because of Anatolian IE's particularly divergent and seemingly archaic (or on the contrary too innovative) status in comparison with simply all the other IE branches, and because apart from BA Anatolia it is clear that a partially EHG population had everything to do with the expansion of PIE in every other region of Eurasia. The fact that there are also several (at least 4 or 5) other language families potential candidates to the position of "CHG-derived families", but very unlike Indo-European (which actually, at least apparently, shares much more with the Uralic of North Eurasia), is also an issue.
Also, because CHG/Iran_N ancestry was already present in very high proportions in the Eneolithic, actually not very different from the CHG contribution in later cultures like Yamnaya, but PIE shared vocabulary (its latest undivided stage) can't be older than the Copper Age or even Early Bronze Age, so if it did come from the South Caucasus it happened very early on, before PIE is even supposed to have existed. If EHG is not found in any future sample in BA Anatolia, I'd place my bets on the once discarded but now revived Indo-Hittite hypothesis, that is, Anatolian being derived from a Para-IE sister language, not from the same language as "residual" PIE. The "problem" there would be that we have to find the specific time when CHG became so prevalent in the Pontic-Caspian steppe before the Eneolithic (~4200-4300 BC). If it was too early, then we'll have to explain how on earth the Anatolian IE and the Steppe IE remained so "close" (relatively speaking) that their connections were still recognizable in our modern era.
It's simply contrary to the evidences to try to derive the bulk of the IE expansion from Transcaucasia instead of the Pontic-Caspian steppe. It would be even more misguided (due to chronology) than trying to find the source of the Romance-speaking expansion in the Americas in Lazio, not in the Iberian Peninsula.