Having been invited multiple times by friends to Infinite Loop for lunch and dinner, and debated the quality of the food vs Google's with them (Google still wins on that front), I can safely say that nobody at Apple gives a shit if employees talk about the cafe.
The Gizmodo article is pretty much bullshit as well, my friends tell me. Unless there are groups at Apple that are more secretive than the UI team/iPhone/iPad are and actually enforce those rules on their own.