The Australian government is in a better position to weather this current crisis and expand the deficit

because it inherited a very low level of public debt.
because it can enforce tax obligations in $AUD on its citizens and the currency trades internationally at market-set parities.
because it has taken a cautious approach by not favouring business or unions.

Answer: because it can enforce tax obligations in $AUD on its citizens and the currency trades internationally at market-set parities.

Please see Debts and deficits again! for more information. If you are unsure ask a question via the comments.