The Irish are Not Celts

[Elmetiacos]

Without understanding a bit more of the methodology of this geographical information system “mtradius” they talk about, it doesn't seem to make sense... here's this massive circle showing that the Irish can trace their matrilineal heritage back to smack in the middle of the Hallstatt and La Tene cores, and so they conclude there was no Iron Age migration? Huh? Or is that exactly what it doesn't say?

EDIT: it seems the method was developed for DNA evidence in criminal cases, to speed things up by narrowing the search to populations most likely to yield a match. So I just don't follow their argument here.