Without seeing his actual contract it's hardly definitive.
But plenty of north posters have been saying he's on $800k per year. Was the 20% pay rise built in to his contract as well? Who knows, but it's been mentioned that quite a few players had this in their contracts.
I think your figure of $600k pa is way way under. He was the standout premium ruckman in the comp with plenty of clubs chasing him. He was a priority re-signing for north at the time. Probably easy North's highest paid player.
He was on 650k, the highest on our list. Now 800k is plausible. We should push it back to 550k due to performance.