It’s the one stop shop for GDPR etc which is a bigger deal as Twitter is legit a loss making enterprise even before some hardcore goblin ninja tax accountants come to play.
This isn’t a court, it’s the Workplace Relations Commission which is intended as a cheap alternative to courts with a limited power of payout. Usually it’s the few thousand a worker is due and that’s all. This guy just happened to be rich (but apparently not rich enough to go to the High Court to get much, much more money).
I would bet, were I a betting person, that Twitter will spend more than half a million on lawyers trying to get out of this. And the lawyers will get paid.