Is anyone else concerned he's telling Google our secrets?

Not in the slightest.  For a start he'd have NDA's to adhere to and I doubt he was privy to the secret sauce anyway.  Also, this isn't like baking a cake and remembering a recipe.  It's much more complicated than that and therefore passing on all the relevant info without access to classified info would be neigh on impossible.  And like p-n-p said there are all the patents.