Like whatever has been said 3 posts up, the 12-month imprisonment is official.

So you should be fine with ETA, even not disclosing. It is up to you you want to do the FBI route. But it is possible that you may not have enough time.

BTW - AUS is the IATA airport for Austin–Bergstrom International Airport in Austin, TX. It would be best if you can avoid use AUS for Australia to avoid confusion.