You are free to ignore the multiple, credible sources I have provided and reply on a short series from the BBC. After all your argument is that there was Iberian influence in Ireland, which is unsurprising given the heavy Celtic presence there; https://en.wikipedia.org/wiki/CeltsThis topic got me interested in doing a bit more research. I watched the BBC series "The Celts" on youtube (good series, by the way) and did some further reading.
As to "scientific consensus": there is none. What appears to be known at this point is that the earliest Irish settlers are likely to have come from along the Atlantic coast of Europe and Iberia. Celtish language appears to have been broadly spread across Europe from north of the Alps to the eastern seaboard to the Russian steppes. Many anthropologists believe it to be the "lingua franca" of the time period, allowing all tribal groups the ability to communicate and trade. However, there is not much in the way of written documentation from the bronze or early iron age on the language, so though this explanation appears to have merit, it is somewhat speculative. Based on the widespread discoveries of Celtic crafts, it seems to be a reasonable conclusion.
The Celts arrived "late" in Ireland which had a healthy indigineous people and culture. DNA evidence (more than the above study of a single individual from antiquity) has been gathered from current residents in Britian. What seems to be indicated is that much of the mitochondrial DNA indicators show that in western Scotland, Corwall, Wales and Ireland (those groups bordering the Irish Sea) there is not much historical influence in the DNA; more indication of Iberian influence.
So, I'd say my world view as influenced by my family appears to be consistent with much of the present research.
By stating that there is an Iberian connection to Ireland you are substantiating my argument. All the Iberian connection proves is the geographical location that the Celts came into Ireland from.
Whether or not the Celts came to Ireland "late" is immaterial and is akin to claiming that there is no American identity, only European, because there was a pre-existing indigenous people in this land and that the new settlers came primarily from Europe. There are numerous examples of Celtic influence in language, culture, art, customs, DNA, etc. that a connection with Ireland is indisputable to anyone having an honest look at the facts.