>>509380777
Even if he were a naturalized Australian citizen, his citizenship can be revoked at the discretion of the Foreign Minister especially when there is a political interest to do so. Sure, there is a statute that limits the government to a particular set of circumstance in which a citizenship can be revoked, but the Australian Federal government is always seeking an opportunity to set a legal precedent that enables them to summarily revoke the citizenship of naturalized individuals.
So in the grand scheme of things an Australian citizenship doesn't mean all that much.