If the source is quarantine hotel then the key dates are 28-30 November, which is when the worker was on site. (Infected 3-5 days ago)
5 family members tested negative
Travelled to work from Minto (SW Sydney), so there is a small chance not from quarantine.
I think on the basis of the latest outbreak, the answer is pretty clear.
For 3 jurisdictions WA, Qld, Tas, the bar for extreme circumstances is pretty low (Eg 1 local case in the community) and slow to remove quarantine requirements.
For 1 jurisdiction NT, the bar is low but at least will...
Given it seems the positive case came more than a week later, it might be worthwhile to consider that it’s a slow virus (long time between infected and infectious). It’s great that you (and assuming most of Adelaide) have been wearing masks) and it’s probably a good idea to be cautious for about...