It has been a couple of years since I connected via Hong Kong. I used to prebook a gate shuttle (golf cart) on either the worldwideflight or the HKAIRPORTCONCIERGE web sites.
Nether seems to work nor have I been able to find how to book the service for a shuttle waiting at the gate upon arrival in Hong Kong.

Any one knows the current contact information to book this?

I found at the HKIA airport a link to a meet and greet Always Service, however they never answer their phone number +852-2275-0000

Thanks