This is just another variation of a similar scam listing that @Louise posted on this same board the other day. This kind of thing occurs most in highly demanded, expensive locations such as Manhattan, Miami, and apparently Bondi Beach. The spammer makes a fake listing using photos ripped off from either real listings or other websites, and directs naive users to contact them off-site.
Posting alerts like yours does help to get the listings flagged by multiple people. But unfortunately, they tend to stay up for a distressingly long time after being flagged. Either Airbnb is playing whack-a-mole with hundreds of spam listings a day, or they don't have enough resources committed to reviewing listings.
My own opinion is that new listings should be subject to staff review before they go live, as spammers tend to focus on frictionless systems that they can easily manage with bots. But that would take several dedicated employees and cost money without adding anything to profits, so it's unlikely to happen.
