I'm really having problems understanding all the crap that's constantly being regurgitated to such a simple condition.
The current law is quite clear, if you're deemed to be a non-resident the Australian tax on your pension is 32.5% starting at $1 - currently nobody in their right mind will put up their hand to say "I'm a non resident" and it's very simple to circumvent the law.
There is currently a proposed move to close the loop-holes by defining what is a non-resident, ie., if you're out of the country for more than 183 days in any 12 month period you will be taxed in accordance with the current law, how this will be controlled / reported / enforced is the only unknown in this discussion.
Will it comes about - who knows.