Not once was it ever actually linked to a specific person. No IP addresses ever matched. But they were either posting from Australia or using an Australian proxy.
Jeff is far from our only Aussie member, and from my experience from other message boards I have found that often times the famous "fake" accounts often belong to little known members with low post counts who do most of their participation through a persona.
At one messageboard I was at there were these two girls who were roommates who both posted there. They each had 5000+ posts going over a period of YEARS, and often chatted on instant messager with other members and emailed them.
Both posters turned out to be fabrications of a 3rd poster, who had a mere 200 posts on his REAL account.