I'd agree, Jetstar don't have anything to do with the cadets until they have finished their Phase 1 training in Australia and New Zealand. It is only then after when they go to do their A320 type-rating that the cadets sign a contract with Jetstar.
So up until then, they are really just doing an accelerated aviation course with Oxford in Aus or CTC in NZ, using FEE-HELP in Australia and whatever the equivalent is in NZ. And with the potential position of an F/O in Jetstar subject to successful completion of the course and a position available in Jetstar.
This isn't the first time cadets have been told "no job for now, we'll contact you later when we have room"... It happened a few years ago and those guys after waiting 12 months all got jobs.
Only difference now is the state of the Qantas group which is quite significant.