No sour puss involved just basic fact. They are all great Oz cars but they are essentially NOT factory produced and yes including the others you mention.
A "factory" car is one built down either Holdens, Fords or Toyotas Oz factory production lines not one subsequently modified by another entity be it HSV, Tickford or FPV.
If these bodies were wholly owned and solely run by Holden or Ford as their own additional performance production lines then yes they could be classed as factory productions but they are not having private owners also involved.
There's nothing wrong with calling the W1 Oz's greatest performance car other than the inference it is factory built.
It is an approved HSV aftermarket contribution just like the Tickfords and FPV's also were
