Australia has CCS2 ports in most EVs including the Tesla.
CCS2 is actually two ports:
The upper pins are AC, low voltage, low current
The two bottom pins are DC, high voltage, high current
When you plug in a DC charger, the large plug fits into all the pins.
When you plug in an AC EVSE type 2 "Mennekes" , only the upper pins are used.
The Tesla UMC EVSE is the AC method.
The question of adapters is not at the car, it is at the wall receptacle.