"Added" in the sense that they put it in the game in the first place? Let me reiterate: You cannot collect the book in any version of the game. It is unobtainable in the Japanese version just like it is in every other version.
It WAS going to be collectable, but Nintendo did the lazy way out and just added a door
and you're right, you cannot collect the book in any version of the game, but I SAID it was able to be collectable
keyword: WAS
get it?