I have never understood why there are speed limits at waypoints such as porpa when the dep is rnav. The aircraft will turn to intercept the next track from porpa so speed is irrelevent.
I agree, does no speed mean wave the 220 at porpa. Does "high speed" on descent mean no req for 250 knots below trans.
HKG is so open to interpretation according to who you are flying with on the day.