Yeah, that's him. Played for the Pirates in Oz before heading off to the Old Dart where he joined Rotherham during their ill-fated season(s) in the old Zurich Premiership. From there I think he went to Edinburgh before disappearing. Desi was extremely fit and took great care of himself (apart from hanging around with Tucky!), his Brumbies/Tahs/Titans/Gunners career all occurred after he turned 30.
He played with another ancient Aussie at Rotherham and Edinburgh, Peter Jorgensen. Peter retired from Randwick last year aged about 37.