You can contact Chris directly, links are on his site. Though with that attitude ("you clearly had time" which is an assumption coming over as aggressive, you do not know what Chris has time for or not) I doubt you'd get a response.
"You clearly had the time" may just not be true, and is technically an unsubstantiated accusation, which is an aggressive form of communication. As said, contact him directly. I doubt he's reading the DTG forums.
I'm not a commercial modeller who has to worry about keeping customers happy, but my response would be along the lines of "Blimey mate, who the ***k are you to tell me what time I have and what I should so with it; and do you know just what is involved in changing a model?"
There is a NZ route however I was not aware of an AUSN route. If there is no route for the rolling stock to serve why would anyone make it? I’m confused. Is there a secret AUSN route I don’t know about? Is there a huge market for this?