I don’t know. An earlier article linked in this article includes this:

An LJ Hooker branch this week admitted to using ChatGPT to write a listing for a rental in regional New South Wales, which erroneously advertised the house as being near two schools that didn’t exist.

…

The Australian Competition and Consumer Commission said businesses that used AI models to generate advertising material should ensure it is checked for any false, misleading or inaccurate information.

“Under the Australian consumer law businesses should not engage in false or misleading conduct in the supply of goods or services, this includes in advertising properties for sale or rent,” a spokesperson for the watchdog said.

So it may already be illegal but technically not fraud.