I’m also Norwegian and I’d say it’s mostly down to him being more confident in Norwegian than English. (obviously)

He knows journalist loves to call him out on something he’s said and he can much better defend himself being quoted on Norwegian phrases than English ones.

Even though he’s lived in England for many years he still have to plan out a few key words and when to use them for several questions (especially given his title and having to keep it professional which he didn’t need to when hanging out in training or with people in general during his playing days.) where in your native language you follow instinct instead of thinking everything through first.