That interview, much like the "Animal Crossing Resident is a character" interview, never really got "confirmed," so to speak, people just kind of decided it was true and it got accepted as fact just like so many other false rumors in this big game of fanboy telephone that is Smash Bros. Brawl.
That said, the interview only said that he made designs for them in Twilight Princess style, not that either of them are playable. So if the interview is true, then they could just as likely be Assist Trophies.