I heard that some operators have been threatened by letter with prosecution if they use the airport for training. Apparently the rule they state applies to council owned roads
tho I haven't investigated this too closely. They haven't sent me anything but the recent standards of Australia Post doesn't mean it hasn't been sent.
I think there is a bit of history if you go throught their council minutes, apparently some schools were talking of relocating down a few years back there if YPJT was closed and that spooked people, there was also apparently a consortium that were going to look at getting land down there and building another airport near there. Some well known local identities were involved, one of whom died and the project was then shelved.
Lets not forget that the bod who tried to charge people to use the NDB at YCUN, also had a touch-and-go fee for gliders
. I wouldn't take their "legal opinion" too seriously!