The point was made that according to the Civil Aviation Act reg's are to be interpreted on their intent and not literal reading.
The information sheets explain the intent.
Whatever else the lawyer might have been trying to say, he wasn't saying that "information sheets" determine what the law means. The law determines what the law means.
Section 15AA of the Acts Interpretation Act? The "purpose" and "object" of the Civil Aviation Act and regs is, allegedly, safety. Which gets you precisely nowhere in working out the intent of the bugger's muddle, because one person's opinion about what is "safer" is another person's opinion about what is "less safe".
The "information sheets" are merely what the author earnestly hopes the law means. Nothing more.