"I think this must be the only man in history to have had his entire head inside the mouth of a Great White and lived."
I don't believe this was a great white...there is a white tip shark, which I think is being referred to here as a "white pointer". It was "only" 3 m long (a bit over 9 feet), much smaller than a large great white at over 7 m (and 2 tons).
I think the crush force from a large great white's jaws would kill you even if the teeth couldn't penetrate. I sure wouldn't want to test it one way or the other... ;-)
He's gonna need a bigger head.
It's just what the Aussies call them.
White Tip can refer to the Oceanic White Tip -a large shark that are usually in open sea and can be found around ship wrecks or can refer to some reef sharks that are usually smaller.