The Department's COVID mini site has been updated today to allow additional categories of persons to be automatically exempt from travel restrictions and can enter Australia, without obtaining an individual exemption.
Those exempt from requiring individual exemptions are:
an Australian citizen
a permanent resident of Australia
an immediate family member of an Australian citizen or permanent resident*
a New Zealand citizen usually resident in Australia and their immediate family members
a diplomat accredited to Australia (holding a subclass 995 visa)
a traveller transiting Australia for 72 hours or less
airline crew
maritime crew including marine pilots
recruited under the Government approved Seasonal Worker Program or Pacific Labour Scheme
holder of a Business Innovation and Investment (subclass 188) visa
Further information on the requirements for these exemptions are available on the Department's site
(Source - MIA)