Well Northern Ireland is a part of the UK.
“Well Northern Ireland is a part of the UK”.
Yes, and that is clearly stated in the first line of the article.
The person being interviewed was a representative of a different country, the Republic of Ireland.
It’s not terribly confusing, if a member of the South Korean government was being interviewed you wouldn’t expect the interviewer to ask about “your president Kim Jong-un”, you’d expect a commentator on international finance to have a basic grasp of political geography.
Geography is fun and not hard. People should try it sometime.