Where does it say they require a start clearance?
I've also checked the latest Notams and DAPs and I can't find any reference.
At Sydney we occasionally have pilots requesting start clearance out of habit more than anything. Perhaps it's the same at YBBN?
FWIW, there is sometimes a start clearance requirement during periods of inclement weather or if there's an AEP clogging the system up. When this is the case, it's put on the ATIS.
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