Just had a look at the form, it might be Confidential but you still have to put your contact details. Anybody I know who flys for a living would not submit one of those for the fear of consequences.
As I said before, anything to do with CASA is toxic and consider ATSB as part of the system. Several times through my career I have tried to let them know about major problems, there was no help, all I got was increased attention by adits and surveillance.
Take a look at prune and what they did to Glen Buckley.
Whistle blowers in Australia are treated like crimminals.