Das Visum war nicht falsch, es wurde wieder entzogen:
"The Australian Border Force will continue to ensure that those who arrive at our border comply with our laws and entry requirements.
The ABF can confirm that Mr Djokovic failed to provide appropriate evidence to meet the entry requirements to Australia, and his visa has been subsequently cancelled.
Non-citizens who do not hold a valid visa on entry or who have had their visa cancelled will be detained and removed from Australia."
https://www.abf.gov.au/newsroom-subs...6-01-2022.aspx