From your link:

  * Open source UNIX foundation 
  ** Support for multiple CPU and GPU cores via Grand Central Dispatch and OpenCL
  * Comprehensive UNIX user environment 
  ** Standards-based graphics built on PDF (Quartz), OpenGL, and H.264 (QuickTime)

Your 2011/2012 document gives less assurance towards any future POSIX compliance.

Unrelated, but there's a whole lot of information about someone named Ernest Prabhakar there…