T&C very clear that a Personal Plat card cannot be used for business purposes, although no idea how that could be enforced:
6.2 Except for ANZ Visa Business Airpoints, to earn Airpoints DollarsTM, the Card account must be used wholly and exclusively for your private and domestic expenditure. Where ANZ has reason to believe that the expenditure is of a business nature, these transactions will not earn Airpoints Dollars.