It to me took TA had been told having CV was not an allowable exemption to get into the country.
Prime Minister Scott Morrison and the Australian Border Force said Djokovic did not provide sufficient evidence to justify his vaccination exemption and he is now stuck in a Melbourne immigration hotel awaiting an outcome.
Djokovic had been relying on a Tennis Australia (TA) exemption certificate issued under the guidance players did not need to be vaccinated against Covid-19 if they could confirm they tested positive within the past six months.
The following has now been clarified as a category for which you may be eligible for a temporary medical exemption: Recent PCR-confirmed SARS-CoV-2 infection (after 31 July 2021) where a vaccination can be deferred until six months after the infection, TA said in a letter to players and their teams.
Djokovic missed exemption cut-off by six days
The same document also made it clear that any applications for a medical exemption needed to be sent no later than Friday 10 December 2021 six days before Djokovic tested positive meaning a positive Covid test would have come too late for TAs exemption guidelines.
https://www.news.com.au/sport/tennis/novak-djokovic-court-documents-confirmed-he-tested-positive-for-covid-in-december/news-story/8bf69b691cc5734c6c08a2d6e4120351