Isn't that what he said? It was taxes he said were fixed, despite the airlines attempts to categorise them as the same fuel surcharges are definitely NOT taxes.That's quite incorrect. Fuel fines are loaded based on point of origin and fuel fines originating elsewhere can be more expensive than AU fuel fines. The UK is a good example... it's notably cheaper to do SYD-LHR-SYD as an award, than it is to do SYD-LHR + LHR-SYD.
Similarly, having an award starting in AU on JL eg. SYD-NRT-JFK and back, incurs almost nil fuel fines. Whereas if you book this as SYD-NRT-JFK + JFK-NRT-SYD you would get hit with much more notable fuel fines.