I’m confused, page-21

Once a company has been delisted, you can go to Delisted.com, pay a $150 fee to arrange a transfer of your holdings for $0, and write off your entire holdings immediately. It's a semi-official service has been around for many years and I haven't heard of the ATO rejecting a single claim.
https://www.delisted.com.au/sell-your-worthless-shares
I'm personally ideologically opposed to having to pay a fee to book a capital loss (as if a total capital loss isn't enough!), but the option is there if you want to save on cgt this FY (time value of money). You can also arrange another private transfer for $0 but you will run into issues where a company is in administration.