Given it is not a public department what's the story? Is it some backdoor way of a law firm trying to drum up lawsuits?
5 seconds on Google would tell you that it is set up by the Federal Government and the Advocate is appointed by the Transport Minister. It is funded by the participating airlines.
The fact that the domain name is owned by Qantas is a bit suspect. The whole thing is a toothless tiger anyway because the Advocate has no power to make binding decisions.