Did they read their notams regarding the closure of 16/34 ML BEFORE departure?
Of course they would have, but all crews operating the QF10 were/are advised seperately of the Melbourne runway works, anyway. Rwy 09 is the preferred runway during the works period, and if rwy 27 is required then a tug is prepositioned to tow the aircraft to the terminal from the end of 27 (due to the A/C not being able to do a 180 turn on a 45m wide runway).
Adelaide is the nominated preferred alternate for the QF10 service.
For those who like to comment on the number of pax carried, you may wish to consider that the load/landing weight into MEL is restricted to allow the aircraft to be able to land in Melbourne (Landing performance limits wise) on the short runway so as to be ready to operate the return service to SIN in the pm.
3 pages of BS so far. I hope I haven't added to it.