Do the FDX 777s use Engine Out SIDs in the FMC database? I’ve seen cases where the EO SID was accidentally executed during the Takeoff Briefing instead of just reviewed. The EO profile for HKG has a slight left turn from 07R and then once clear of the hills a right turn to stay over the harbor. This flight track looks similar but the right turn was late which could be a result of confusion in the cockpit once realizing something wasn’t right.

Thankfully, HKG ATC is amongst the best in the world and watches terrain separation very carefully. Many airlines have made mistakes in HKG.