You cannot believe everything you read online...
(1) Australia is not in Asia
(2) Australia does not require you to have an IDP.
All Australia requires is either...
(1) A licence that is in English (e.g. a Thai licence), OR
(2) A foreign licence accompanied by an English translation (the translation could be an IDP, or it could just be a simple informal translation.)
But check the current regulations for the state in which you wish to drive, as requirements can change. For example, New South Wales used to allow the driver to translate their own licence into English during a traffic stop.