First of all, an admission of error. Our ATC flight plans are not filed with a SID or STAR for HKG.
Correct, you don't know what runway will be in use at planning stage so the SID/STAR is not inserted. Our Flight Data Processing System appends the SID/STAR based on the runway in use at activation time. As Bedder pointed out, our system doesn't know if you are RF capable or not, and the procedure is not mandatory even if you are, so will issue the normal SID as default. If you want the RF SID then simply request it.
To clarify my non-approval statement.
I was assuming your aircraft was RNAV 1 approved by the State of registry.
I took it your question was in relation specifically to any special approval required to use the RF turn.
If your aircraft is RNAV 1 approved and your FMS is RF path terminator capable, you can fly the RNAV(GNSS) SID using the RF turn.
As I indicated before, this is different from the 2 RNAV(RNP) approaches (previously referred to as RNP AR approches by ICAO) to the north runway which specifically require CAD approval due to their requirement of RNP 0.3 in the intermediate and missed approach segments for obstacle clearance.