(And the fact that only 2 MPs voted against it tells me there's almost certainly some back-door dealings that resulted in this bill being passed.) Not really,

(And the fact that only 2 MPs voted against it tells me there's almost certainly some back-door dealings that resulted in this bill being passed.) Not really, that's just a consequence of the Australian Parliament's history of very strong party discipline. It is highly unusual for all the members of a parliamentary party not to vote the same way on a bill.