@aussiebobaustin , understand your position .
(a) We are here to help but the decision / filing and standing behind the declaration ( filing ) is definitely ONLY yours, no matter whom prepares your return.
(b) Whether an income is taxed by the USA is per the US laws and as modified by any tax treaties in effect at the time of filing. However, you as a filer / tax payer MUST declare each and every income for the tax year unless specifically excluded by tax code. Thus you will need to declare this income from Australian source and then either pay tax on it or exclude from taxable income by using treaty assertions ( form 8833 ).
Good Luck.
If you need further help / explanation, please feel free to either extend this thread or start a new one.
pk
