Awesome fish isn't it!!!!
As far as I am aware, that fish is the second biggest released, popper caught GT that I am aware of (estimated). The biggest caught and released was taken by Nomad - some 68kg of Silver Brute (weighed, scales).
There have been bigger fish caught, the only one I know for sure on popping tackle was taken while popping land-based in Tokara only last year (72kg) - sadly, it was not released
There have been GTs speared and sighted in excess of 90kgs in Hawaii, and we know fish exist that big in places like the Coral Sea/Shoalwater, Australia and New Caledonia.