Gittens is plain wrong. Money has not worked that way since 1971.
Australia has a sovereign fiat nonconvertible currency. The Federal government creates money by spending it into the private sector and cancels it by taxation.
The government does not operate like a household or private business that can't create its own money.
Clearly the government doesn't wait for the ATO to collect money and then hand that money over so they can spend it on something. The principle is still the same though. The government relies on taxation revenue to cover their spending. The federal government spends real, actual dollars on things and that is paid for in the most part by taxation revenue.
Borrowing is what enables a government to smooth out their cashflow if you like (at the end of the day, government departments need money in their bank accounts so they can operate).
The reality is a government can't just produce currency without a) accounting for it and b) cancelling equal amounts otherwise it leads to inflation and devaluation of the currency.