T2 is better described as a check-in area although it is called T2. Your flight will depart from T1. The Priority Pass that comes with the Canadian Amex Plat will get you into both airside Plaza Premium Lounges.

Check out this thread:
http://www.flyertalk.com/forum/hong-...unge-hkia.html

There was one report here that the Canadian Amex Plat will also get you into PPL landside arrival lounge near T2. However, it is not listed in both Priority Pass and Canadian Amex Plat web sites as a benefit.