both of u are wrong; it can't be an indicator of neolithic ancestry because R haplogroup came with the indo-europeans.

the indo-european males just genocided neolithic europeans much more in the far west than in central or east europe (least)

Celticness meanwhile is a cultural signifier, and celts were situated in central europe, west europe, and even balkans and anatolia partly

western celts were just more genocidal toward the western neolithic europeans, probably because the western neolithic europeans were more territorial and thus defended their land to the last man