This is correct. mocha AE CS6 is not available as a stand alone app anymore. It needs to be launched from within AE CS6 animation menu.
This was a decision made by Adobe After Effects team and allows mocha AE CS6 to be supported for all AE installs: trials, educational and cloud support.
Please note that for $199 you can upgrade to mocha AE v3 from Imagineer Systems (or Toolfarm) which adds FCP, Motion, Boris support and new 3D camera solver. mocha AE v3 or mocha Pro v3 are opened as stand alone applications.