If you talk about the Irish Diaspora, most Irish people arn't gonna think about Joe American whose great great grandfather came over in 18-whatever. They're gonna think of the millions of 1st and 2nd gen immigrants who are Irish by nationality, not ethnicity.
My point being that this sort of thing is deranged, and thats why its being posted on Twitter by some crazy Zionist, and then posted to this comm.
I really liked the bizarre setting they did, Fantasy London becomes A Medieval Sci fi city in the south african desert? Fantastic. Vimes running around dressed like a pirate with smoky eyeshadow? Great! I think though the whole story and writing was a mistake. Like even if you divorce it entirely from Discworld (which they should have done) its just not a very well written story.