I think it’s highly likely that they were based in some professional social-media-influence operation which either (a) has learned to disguise its true country of origin because social media companies not run by Elon Musk have started taking active countermeasures against them and so it’s useful to jam up the easy ways to categorize their traffic based on location of origin, or (b) is based in the US.

Speaking as a yank, It doesn’t make sense to me that a whole bunch of yanks would suddenly get organically invested in what happens with Ireland’s immigration policy, whereas that other thing happens all the time.