Few comments on this maps.
The author of this maps Guido Garducci has no single peer reviewed paper. More ever I couldn't find any paper authored by him the last time I checked this subject.
So most of his claims should be taken with caution.
Nevertheless he decided to write a book on Iron Age pottery in historic Armenia. And proposed a name Nairi ware.
What he calls "Nairi ware" is usually labeled "grooved ware" in academic papers.
The grooved ware spread all over historic Armenia immediately after the late Bronze Collapse in 1200 bc. In many places grooved ware people created new settlements.
Scholars usually place the origin of this type pottery in the East or North of historic Armenia, were more older specimens of grooved ware are found.
Veli Sevin linked it with Mushki specifically mentioning that it was an IE tribe. The timing is very good for Mushki theory. Graducci is also mentioning Mushki in relation to grooved ware.
Despite this Sevin's opinion was criticized for giving exclusivity to IE Mushkis and an alternative theory was proposed that it was Uruatri people pottery. This theory also has good timing but has other problems because Uruatri was initially a small polity. Interestingly the grooved ware was present in Urartu but the distinctive Urartian red elite pottery is not directly related to it.
And finally it must be noted that Lchashen culture was relying on grooved ware at last since 1500 bc till the arrival of Urartu at 800 bc. Here the link of ethnicity with a pottery is very secure.
So finally who were those people spreading the groove ware at Early Iron Age (1200bc) all over historic Armenia?
Almost certainly not the Nairi because the term Nairi is mentioned before the 1200 bc. But offcourse they settled in the lands of Nairi also and became part of it.
In other peripheral regions also the grooved ware people were assimilated by the neighbouring Luwian , Semitic cultures.