Its not, if the text comes out to be hero of time, its hero of time. Dunno what else it could translate too, unless its very vague and could be hero of a past time. Hell, its obvious with or without Nintendo's confirmation, but because they've flat-out revealed a lot in this book, its good to see the guessing game is over.
Also, some of the art work is amazing. The concept master sword for OoT is almost superior, and the Fi range from amazing, to eh at least we got this. Also, oracles concept Ganon has to be my favorite artwork of him.