As far as I can follow the accusations this is the current state:

  - lied about travel activity beforr entering Australia (he declared not having traveled within 14 days prior to entering the country but he flew from spain and had an interview in serbia during this time)
  
  - if what zerforschung found here he did not have a negative PCR after getting a positive PCR test first (which would mean he cannot infect others and has bery likely immunity), but a negative PCR and *then* a positive PCR after, which could in the worst case mean he was infected and still travel.

In any case my doubt about the truthfulness might be colored by my experience with the uncorrupting nature of serbian bureaucracy. Were I had multiple instances of public officials trying to get bribes for very basic things.