It's a valid assertion, to an extent.
From a moral perspective however I think they just aren't getting it. They see the fact that they weren't allowed to shaft Ireland as a 'failure' and a result of them not nurturing their own diaspora in the way Ireland has done.
As if it's all a dastardly plot by those sneaky Irish to subvert UK interests. Our diaspora are intrinsically connected to us by our ancestral suffering at the hands of our British overlords. The lobby has strong roots in the genocide that gave rise to it and any British lobby will never be as strong because people unite through common suffering and not through the pleasure of oppressing other nations.
Their study should really have said 'The Irish have had the moral high ground this long time and the 1.5 million displaced unfortunately never forgot the 1 million we starved to death nor did they ancestors. Now it seems the chickens have come home to roost'