This is a significant development. CASA is using technology developed for improving the safety and efficiency of air traffic and using it to initiate punitive measures.
Can you imagine the difficulty in combating a bogus fine? What if the 'air traffic system' has a burp and doesn't record the issuing of a speed waver. CASA records it as a breach, sends out a fine and is chasing you and your license. 28 days or so later you find out about it and what have you got recourse to for evidence? CVR tapes long gone, ATC tapes - possibly not available. It's just your voice against theirs saying "but I was issued with a speed waver - I swear...!"