It’s true that private sales are not allowed on realestate.com.au – unless through a Licensed real estate agent (such as PropertyNow) and by using a methodology like PropertyNow does.
They allow PropertyNow’s listings, which are agent assisted sales. They do not permit Private Sales or any sales that are not through a real estate agency. After pressure from PropertyNow in 2011, realestate.com.au completely changed its view about the acceptability of what PropertyNow does – i.e. that private sales were acceptable via the system that PropertyNow uses.
Realestate.com.au is completely aware of the PropertyNow business model and your listing is absolutely permitted. It is true that some other companies have been removed from realestate.com.au because of the way they approached their business but PropertyNow has remained.