https://www.instagram.com/p/CAQzgmOh...=1h0vl233cv6ux
The IGTC instagram is saying here that the GT part of the 12hr is still on at this stage. Supercars themselves have said in their revised calendar update that "As for the second Bathurst round, it’s not yet clear what portion of GT racing will feature given current international travel restrictions", which suggests it's just up in the air at the moment.