Not that it is much help, but the TGA did respond to my message.
From TGA;
Thank you for your enquiry to the TGA.
Hearing aids that meet the definition of a medical device as set out in the Therapeutic goods legislation, require approval by the Therapeutic Goods Administration (TGA) prior to legal supply in Australia. Approvals require submissions to be made by the manufacturuer or their Australian representative.
Generally the TGA does not disclose if an application has been submitted as this is potentially commercially sensitive information. You will need to contact Apple, the manufacturer of the device directly to obtain this information.
To date, the TGA can confirm that a clinical grade hearing aid manufactured by Apple has not been approved.