@Kate204 I haven't heard much about how Airbnb is handling the Australian fires, but in the past they have given a wide latitude to guests canceling travel to a region due to a widespread and unpredictable natural disaster.
In my opinion the Extenuating Circumstances clause is used too much in cases when the guest should have bought travel insurance. However, if your area winds up under evacuation orders this policy would also protect you from cancellation penalties.