I don’t think you understand what happened today. There was no decision about vaccines, the unvaccinated, medical exemptions, natural immunity from recent infections or special exemptions which benefit the community.
Djokovic lost because the law, drafted by the current government, was designed to make the Minister’s decisions immune from judicial review.
As much as some people might like the result, this was a politically advantageous position for strong borders by a government who are already in election mode.
So I think your focus on Joker being influential or not is moot.