It isn't a false answer. You can use only one App Store at a time. Your account is registered currently in the Australian App Store, as the alert states. You may not use any other App Store associated with any other country, even if you are located there at the moment.
To use the Philippine App Store you would need to be a legal resident of the Philippines. You would then need to change your account for the App Store to the Philippine App Store and provide an authorized payment method for the Philippines with a local Philippine billing address.
ASC - Late 2012 Mac mini, macOS 10.15.3; Watch, series 5 GPS/cellular, watchOS 6.1.2; iPad Air 2, ipadOS 13.3.1; iPhone 8+, iOS 13.3; TV 4th Gen, tvOS 13.3.1; HomePods, audioOS 13.3.1 and Airport Express w/ Airplay 2