No, you cannot see outdoors from Le Cellier. It is down a path from the lagoon and I'm not sure there are even many windows from which to see outside - even if you could, the angle wouldn't work.
Le Cellier ws designed specifically to block out all activity of the park. It was meant to be a place you could escape if you were feeling Epcot overload. But step outside the restaurant and you'll have plenty of good viewing vantages.