Some years back the ATO requested the registration register from RA-Aus because owners were hiding behind their confidentiality clause on the regos. Apparently a number of “pensioners” were getting around in $100k+ aircraft.
An aircraft owner mate told me years ago that on the pension form it says words to the effect of “do you own any assets such as a caravan or boat” and he said he didn’t mention it because aircraft was not on the form.