[Someone]

I have a X11.app in /Applications/Utilities. When launched, it shows a dialog:

  An application has requested access to X11.
  Would you like to install X11 now?

  X11 is no longer included with OS X. Apple continues to support
  the development of X11 on OS X with the open source community.
  Clicking “Continue” will take you to an Apple Knowledge Base Article
  which provides information about installing X11.

                                                 [ Cancel ]  [ Continue ]

So, I think that "and giving me this when I search their knowledge base for answers" is a bit dishonest. At least on my system, searching wasn't necessary. Apple pointed me there.