Having stood on an Aerobridge & listened to a QF duty Manager tell the ACO where to park "our" aircraft so that "his" aircraft could park at the Gate (D3) we were set up on, it has all the hallmarks of QF telling MAC what to do.
If the Airport authority instigated this, then I am amazed. Why, in an age of political correctness, would you give what is arguably a lucrative name (Terminal 1) to an individual operator? Surely a shared terminal (INTL) should carry this title. Also, the numbering sequence is not logical, they'll just confuse the plonkers that travel...definately a QF decision.