Huh?? Wrong. Of course they (QE) still have the data, and the ability (within TS) to review it.
The issue with the RR -524 fleet is well known - related to the HPC. Whether this QF11 event is linked only time will tell, however there have been numerous HPC failures in recent times and they typically result in a bang and then sparks out the back etc that the media outlets love. The fault is not linked to the maintainer - but instead to design.
I'm not talking down the significance of the fault though - a HPC failed engine is cactus and I would imagine that a self-run engine line would have assisted with the speed that any fixes were/are rolled through the fleet.