Legally their identity might be 'completely' protected but in reality it's common knowledge and easy to find out through legal means. I'd suggest that many members of WS know their names.
Doesn't matter. Anyone publishing their names risks being hauled before the judge who imposed the suppression order(s).
This puts me in mind of the famous Costigan Royal Commission into activities of the Painters and Dockers Union.
One witness was given the code name of Squirrel by the RC but Goanna by the media.
After a while, graffiti could be found in prominent places in Sydney saying "Goanna is Kerry Packer".
At that point KP had to out himself and publicly deny the related allegations about him.