No Giant aust. are just falling in line with the rest of Giant by having a convention of dura ace or xtr means 0, ultegra or xt means 1...Seems they've gone from having a Trance 1,2,3 to a Trance 0,1,2.
Trying to trick people perhaps? Thinking they're buying an equivalent 06 Trance 2 but really its more like a 06 Trance 3.