Yes I can say that. Caught up in T4 Melbourne Friday for 6.5 hours due to 4 hour flight delay. I tested positive to covid Monday morning. The previous 4 days in Melbourne were 100% covid safe, masked, hire car, no public transport, restaurant etc and none of the 4 people I interacted with have covid. Issue with terminal and flight as I see it, most pretend to drink hence no mask. Covid is not the flu for many of us.
Considering how big Melbourne airport is and the outside areas available you must not be practicing very good "Covid safety". Once you check in you have ample spaces to remove yourself for 6 hours at least 10 meters away from others.