Your accountant was likely referring to the services provided by delisted.com.au, which buy worthless shares off market. See https://www.delisted.com.au/sell-your-worthless-shares.
Whilst, a liquidators declaration is a CGT event, from a quick search of ASIC's register it appears that a liquidator has not been appointed to Byte Power Group Ltd, so I wouldn't be holding out waiting for one in the near term.
