The story covers the fledgling technological possibilities and that national cabinet is aiming to implement a plan for such proof of vaccination for quarantine free international travel. The story goes on to say that a few of the usual Lib Nat suspects are against making it a requirement for domestic travel, or at all elsewhere.
If such a scheme can work, you can bet that a couple of state Premiers will mandate it, meaning that it will become a defacto requirement.
The digital wallet technology is based on an ICAO development, and the government has already received help from Apple and Google to add such a proof of vax to their phone wallet apps.