It is my understanding (based on an A320 and an assumption that the A330 architecture is similar) that a loss of one or all ADIRUs does not lead to the failure of the FCC [Flight Control Computers]. If there is no information from the ADIRUs or it is invalid, the FCCs switch to Direct Law. Therefore, it is unclear why PRIM and SEC failures were indicated if ADIRU failed.
The Emergency Electrical Configuration theory also looks sketchy to me. ACARS/SATCOM was operational at the time of the failures, and as far as I know they are supplied through the AC1 bus (which will have to be lost to get to EMER ELEC).