FGD, From the report,
Although the crew received numerous ECAM caution messages, none of them required urgent action, and none of them indicated any potential problems with the aircraft’s flight control system.
Do you have any idea of the number of computers on an A330 that have a direct input into the FMGEC?
The actual fault was with ADIRU 1, which never came up on the ECAM. So, which computer or computers do you isolate? All of them?; leaving yourself on the Rudder backup and the manual trim to control the aircraft with?
The loss of the autotrim is a symptom of direct law, but the report states that the "Use Manual trim" message never appeared on the PFD's.... so what Law is the aircraft operating in? Is it any wonder that there was confusion?
Utimately is doesn't matter what Law the aircraft is operating in if you apply the "Golden Rules" of flying an Airbus... that is, if it isn't doing what you expect, take over and fly it manually. Which is what the captain did.
....Manual thrust, manual trim and using the standby instruments... go through all the checklists, look after the passengers and accomplish a safe landing with a highly suspect flight control system and no clue as to the real culprit.
This crew was faced with a Black Swan event. It had never happened before.
I hope to half as well if something like this ever happens to me.
As to your amateur intimations that the ATSB somehow erred in their estimation of the performance of this crew; you are out of your depth and it shows.