https://archive.sclqld.org.au/qjudgment/2022/QSC22-041.pdf
Rather than reading a 10th hand account of this on facebook (if anyone is still interested) feel free to review the decision of the Queensland Supreme Court at the above link given 5 April, 2022, dealing with whether the Chief Health Officer was required to give reasons for three directions made in respect of COVID matters, generally going to vaccination status.
And the answer was “no”, though the question revolved around whether the directions themselves were matters of a legislative nature (in which case reasons were not required), or an administrative character (in which case reasons would be required).
Ultimately not a particularly fascinating topic, but it is a subject that seems to generate debate of much enthusiasm.