Upvote:5
No, that does not appear to be the case anymore. The authoritative reference appears to be the Visit Visa / Entry Permit Requirements for the Hong Kong Special Administrative Region, by the Immigration Department (last updated July 2015), and it makes it quite clear that there are three separate categories that countries fall into:
...plus a few minor exceptions for diplomatic/official passport holders only, and the major exceptions of mainland China & Taiwan which have entirely separate procedures.