Generational
Non-ETOPS and without the APU, I guess they'd be down to single generator (or does A330-200 have an HMG?). Doubt it.
.
Whether the FDR and CVR would be powered by the Ram Air Turbine after the loss of both engines on the 330?
.
The answer is that "the digital flight data recorder (DFDR) is powered by AC BUS 1 in the A330-200. Hence without engine driven generators or the APU it is inoperative"
.
It thus would appear (as with the SwissAir 111 crash) that, as with the Air Transat airbus, there can be no data available about the extraordinary last phases of flight for any Jetstar A330-200 dead-stick landings (at Bali or elsewhere).