Special,
The query is from Lara, Victoria: CASA Regs apply, not CAA
Any resultant liability is a consequence of the Victorian State and Australian Federal legislation.
Yes, you can land on private property in Australia. Any legalities are best researched by the aggrieved party through the local, State, and Federal legislature, not an internet forum with guesses from around the world
I'd expect even a PPL Fixed Wing driver to have the smarts to know that, hence the wind-up alert