As you can see there is a taxable component
Yes that is because Qantas exceed what the ATO think is a reasonable amount. It does not make it income. Just give up on this. The ATO does not think that your allowances are part of your salary.
Is there a point to your interest in allowances? Will it help get Qantas back on track after years of neglect? Will it help any 73 be inspected for wing cracks any faster?
I suspect that they think it is a way of somehow lowering people's salaries by claiming allowances are part of your income. That way they pay a lower salary then the allowance part which is variable and tax free which means less actual money paid out.