I'm not entirely sure at this stage, TB. Job ads on that site are automatically cancelled after a time period. The job may or may not have been filled. There was no date on the ad to say when it was active.
Also, their application to deregister as a company was dated 05/11/2008. The application was processed according to the text on that page:
"Page numbers are shown if processing is complete and the document is available for purchase. "
And from my personal experience, deregistering as a business is something that can be put into effect instantly.
I've sent an email to the tech administrator of the domain name ruyan.com.au but have not yet received a reply, and am not really expecting to.
Edit: I've also emailed Albert Nisman from Egar to see if he is able to clarify anything (being the guy who was supposedly "dobbed in")