This is from GoNintendo.
In Japan, the Koopa Kids are actually the henchmen. It has always been that way in Japan. Overseas, they became the Koopa Kids.
Miyamoto’s response seems normal unless there is a change in the overseas games. There shouldn’t be since WE ARE REGION LOCKED. There is no point of being region locked if we have to share Japanese context with games. It is bad enough the Western controllers are all using tiny buttons made for small Japanese hands.