Question: Can non-citizens leave from Australia?

Answer passage (source: Australia):
page_title: Leaving Australia
section_headers: Non-citizens
section_content: Due to the current COVID-19 situation in Australia, including state and
territory border restrictions, business closures and social distancing
requirements, international visitors are encouraged to return home when
possible to do so.
Temporary visa holders should be aware that if they wish to return to
Australia while COVID-19 restrictions are in place, they will generally need a
travel exemption. For more information about the Commissioner’s Exemption, see
Coming to Australia.

Reviewer feedback on this answer:
States clearly that non-citizens can are even encouraged to do so.
This talks about how visa holders can leave Australia.  It seems like it is related, but there is no specific info here.

Reviewer ratings:
Excellent
Could be Improved

Answer passage (source: Australia):
page_title: Leaving Australia
section_headers: Australians and permanent residents
section_content: If you are an Australian citizen or a permanent resident you cannot leave
Australia due to COVID-19 restrictions **** unless you have an exemption. You
can apply online but you must meet at least one of the
following:

your travel is as part of the response to the COVID-19 outbreak, including the provision of aid 
your travel is essential for the conduct of critical industries and business (including export and import industries)
you are travelling to receive urgent medical treatment that is not available in Australia
you are travelling on urgent and unavoidable personal business
you are travelling on compassionate or humanitarian grounds 
your travel is in the national interest.

You must provide evidence to support your claims that may include:

passport/s
marriage certificate/s
birth certificate/s
death certificate/s
proof of relationship (for example, shared tenancy agreement, joint bank account etc.)
visa status
proof that you are moving to another country on a long term basis such as leases, job offers and evidence your goods are being transported
your current visa status, including in Australia and/or overseas
letter from a doctor or hospital about any medical treatment/condition with statements on why travel is necessary
letter from an employer showing why the travel is necessary or that the work undertaken by you is critical
statement or evidence to show when you wish to return to Australia
any other proof you may have to support your claims.

All evidence supporting a travel exemption claim needs to be officially
translated into English. ****
You should apply for an exemption at least 48 hours before, but not more
than 3 months before your planned travel.
If you are not granted an exemption, you should not continue with your
travel plans. If granted an exemption, you must take evidence of that
exemption decision to the airport.
You will not need to apply for an exemption if you are:

ordinarily resident in a country other than Australia
an airline, maritime crew or associated safety worker
a New Zealand citizen holding a Special Category (subclass 444) visa
engaged in the day-to-day conduct of outbound freight
associated with essential work at offshore facilities
travelling on official government business, including members of the Australian Defence Force.


Reviewer feedback on this answer:
Gives a direct answer but is buried beneath a lot of text that does not apply to non-citizens
There is a lot of info here.  It states about when you can leave the nation and when you cannot leave the nation.

Reviewer ratings:
Could be Improved
Excellent

Answer passage (source: Australia):
page_title: Frequently Asked Questions
section_headers: COVID-19 Pandemic - Australian Government Endorsed Event (AGEE) stream of the Temporary Activity (subclass 408) visa
Frequently Asked Questions
When can I apply for the COVID-19 Pandemic event visa?
section_content: You should only apply for this visa is you are unable to depart Australia,
your temporary visa expires in less than 28 days (or did not expire more than
28 days ago) and you have no other visa options available to you.

Reviewer feedback on this answer:
The question pertains to leaving, not trying to stay longer
This answer talks about applying for a visa.  The question was about whether you could leave the country.

Reviewer ratings:
Bad
Bad