From Walshs paper:
The principles of independence and the protection of sensitive safety information in the interests of future safety have been firmly protected. These are considered non-negotiable ingredients for a successful safety investigation agency. These principles have been bolstered with the introduction of the Transport Safety Investigation Act 2003 after nearly two years of consultation.
That principle is Now totally destroyed by a "memorandum of understanding" between ATSB and CASA such that no pilot in their right mind will talk to either.