1800 BC.
Too early for IraniC peoples or indeed any indo Europeans.
Perhaps Hurrian?
Lot of folks lived in and/or rolled through the area, also, it may be puzzling right now if it’s an outlier compared with other finds in the area. Also the dating hasn’t necessarily been verified.
Proto-Indo-European is much earlier than that. The earliest Greek speakers invaded Greece no later than 1900 B.C. The Anatolian languages (Hittite, Luwian and Palaic) were in Asia Minor by 2000 B.C. (they are variously considered Indo-European or a closely-related language family).