No, you can authorise the credit reporting agency to release your report to a third party during the ban with written permission specifically referring to which party you're authorising the release.
It doesn't matter much anyway. None of the risk is going to go away within 21 days nor does the risk materially decrease after that time. Some hackers might even wait until the storm dies down a bit. Likewise, Optus is hoping that 3 weeks from now when the arbitrary ban comes off, this will be out of the news cycle -- and for the most part, it will be.