Leeds are pissed at him for saying things about 'being bored every night, on his own looking at the same 4 walls etc' as part of his homesick story - they went out of their way to make sure that wasn't the case and had either players or welfare officers spending plenty of their free time with him to make sure he felt welcomed and part of the club. He also pushed Leeds for a place of his own (he was originally house sharing with Brett Delaney), and Leeds got him a place of his own about 3 weeks before he returned to Aus. So for him then to make out he was left to fend for himself has been a bit of a kick in the guts - hence the being so stubborn. Whoever decided that angle was the way to go on the homesick front is probably responsible for the approach Leeds are taking.
I still think it's BS though - regardless of what he's done, how can Leeds say 'we're not going to pay you, you're not welcome back here to start earning, but we're not going to let you earn anywhere else without a fee' - they're holding him to ransom and that doesn't seem right as he now as no options to earn a living from the game for 2 years, in what is already a short career.
Surely if they're unhappy with his behaviour (not turning up for pre-season), then they sack him and sue him, not just stop paying him but still hold him accountable to the contract duration.