It is very likely that they were cooling down the brakes, as I understand that the A330-300's of Qantas are not fitted with brake cooling fans like the A330-200's. They would have been cooling down the brakes after it taxied out for take-off.
VH-QPA had the same problem here in Brisbane last Thursday. It taxied from the International terminal to the end of runway 19 at very slow speed, and then commenced its take-off roll only to stop suddenly as the brakes were overheated. The crew elected to hold at the end of taxiway Alpha for 10 minutes to cool down the brakes instead of taking off and leaving the gear down.
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