No, the Australian federal government (responsible for securing the country's borders) didn't give Djoko the medical exemption. The medical exemption Tennis Australia (TA) granted (arranged, sent) to Djoko was approved by an expert panel established by the Victorian state government in December 2021, though the Australian federal government officials had told Craig Tiley (CEO of TA) twice in writing in November 2021 that having Covid within the last 6 months was not a valid reason for an exemption from vaccination in order to be allowed to enter Australia.