It's not the Japanese. It's that there's some Japanese talking about the stage being set and then none explaining what the stage is or how it was set. It has to be the game. It doesn't matter what language it's in, that's what makes the most sense.

The importance of this is that Hyrule is one kingdom at the time of ALttP. The intent part of it would be ancient and not worth anything, especially since Miyamoto said ALttP was always thought of as the sequel to LoZ. FSA seems to be saying something different, of course, but people like to ignore that.