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There are 8½ 'terminals' at TBIT and not all are connected airside.
For *O there is only the Business and First lounges at TBIT, the F/L & A/C at T4 and I believe they are building a new A/C at the AeAgles Nest (remote terminal). T$ and TBIT are not currently connected airside (although with current construction they are planned to be later next year.)
Without an airside connection, you are supposed to have BP's for a flight using the terminal to get airside.
I have often arrived at T4 off an AA and made my way to the F/L there before heading to TBIT to catch my QF flight home.