Am I able to use a Standard that has been withdrawn?
Yes. Standards Australia website provides the following information:
The withdrawn status does not impact the document’s availability, or public’s ability to use the document. Withdrawn standards can still be purchased from our distributors. The withdrawn status indicates that the standard is no longer relevant. Standards Australia will not undertake further work to maintain or update a withdrawn standard. It is still possible for a withdrawn standard to be used within an industry or reference by a government if they choose to do so.