Actually Game Freak probably knows all about Smogon. Its hard to imagine them not being aware of the largest competitive community in the world focused on their game.
I doubt Gamefreak cares about Smogon, but I'm sure they know all about it.
I'd wager that they know about Smogon, but there's probably so many sites dedicated to Pokemon in some form or fashion that GameFreak really just doesn't know much about Smogon on an in-depth level.
On the other hand, I suppose Kyurem might be evidence that they know more than we think.
It's a conspiracy, man.