Its a disgrace that the only two parties that could have known, one or both has leaked them to the media.
I totally agree with your sentiments but it is possible that pretty much the whole pilot group (100?) knew the identity of the crews involved. All it takes is loose lips and the name is out. Has happened before with paxing crew chatting with media sitting behind them or at a coffee shop etc. I would be surprised if CASA would let information out especially.
So maybe the FO did his job correctly albeit a touch late, maybe he/she prevented a tragic accident?
Certainly not at Tullamarine as the aircraft only climbed back to 2500' after ATC instructed the crew to do so.
In the Avalon incident who knows but if the aircraft was too low then the FO was not effective in preventing this and also did not keep ATC in the loop as to their intentions.
So if it was the same Captain was it the same FO? If not then that means two FOs
possibly need some CRM assertiveness training. Or alternatively if they believed being that low was okay then perhaps they need some remedial sim work?