I think a lot of Northern Irish people would disagree with that statement about them being Irish !! Ireland is a separate country all together from NI !!
As is England separate from Scotland and Wales simple geography really. Northeren Ireland has pounds and pence Rep Of Ireland has the Euro etc totally different country
Erm they are Irish wether they like it or not. They are not from the Republic of Ireland for sure and they hold a United Kingdom passport, but they are neither English, Scottish or Welsh.
Or am I asuming there is a new nationality called Northen Irish? I suposse that would work.
Just to add my view on thw whole troubles thing, I believe that should Northen Ireland whish to remain part of the UK then I am very happy about this. In fact I would prefere it if they did so.