Well I think first of all we need to agree on what's meant by penal.
Jim is using the definition penal = "difficult" which I'd argue against until my dying breath. To me, a penal course is one that leaves you no recovery from a misplayed shot (i.e., OB, lost balls, water hazards esp. the non-lateral variety, bunkers that you have to come out from backwards, trees so thick you have to come out sideways and even that can be dicey, rough so thick you may not even be able to get the ball out to the fairway, etc.)
For the pros, ANGC for all practical purposes has no OB and no lost balls. There is water but you can avoid it by playing safe (laying up, playing further back and to the right on 11 & 16) The trees, while they take a lot of flak for being more numerous these days, certainly do not generally prevent the golfer from having a play at the green or at least getting ball in the area of the green where there's a chance at an up and down. The bunkers are quite playable and the rough not even worthy of the name.
So no, ANGC is definitely not penal. Its longer and more difficult than it was 10 years ago, but no more penal by any measure that matters. Your average California course routed through a housing development with the goal of maximing fairway frontage and with various wetland set-asides is far more penal than ANGC.