So confussledvy, got a pic of the VY with a 12 pin plug?
Seems the few I had a chance to look at today that rolled through the workshop had an OBD II style plug.
Maybe some wangnut cut n shut the wrong plug onto the car for some random unknown reason (trying to make a cheap OBD II scanner work perhaps).
As lmoengnr said, a tech2 with the AUS card will do pretty much any holden from 1998 - 2013, commodore, barina, cruze, rodeo.... and how ever many more.
If it has an import card in it (AKA clone tech2 from china without the AUS pcmcia) then it won't do much at all.