Chinese airlines, are crew to quarantine themselves for 14 days? What about crew members standing around reception areas at the various hotels whilst checking in? The issue grows when you consider transport from terminal to hotels, hotels and other guests, hotel cleaners, etc.
Since only aircrew who have been wearing appropriate PPE are allowed in, I would imagine that they "self-isolate" at their hotel for the day or two they are on layover. As far as mingling with other guests, transport etc, I imagine they mingle no more than the relevant Aussies who pass through the rest of the airport, carpark, taxi, train, bus, on their way home to "self-isolate". I would also imagine that hotels would be aware that the crew are Chinese, and have adopted suitable cleaning regimes for the rooms used.
How many aircrew around the world have been confirmed with Coronavirus since the outbreak?