I'd suspect, perhaps incorrectly, that a 777-200ER with an airline like MAS would more than likely be kitted with SATCOM.
Just because the airframe in question did not have a particular SATCOM antenna subject to an AD does not mean it didn't have one period.
I would also think the comm system would have to be "logged on" to ensure it was operational on demand.
How would an international airline maintain 'operational control' without SATCOM? VHF/HF voice-data only? Unlikely.