Morph, I saw your spit film where you had a brilliant ping on a 109's wingtip and brought him down. That was awesome, but it's not the case here. The hit was in the wingroot; it should be pretty sturdy there - its both wider in surface area, and thicker at the same time so two or three 20mm's will never do it.
If he hit the wingtip - yes, if the elevator thingies - yes, and definitely it would result in pilot kill if he hit the cockpit. I agree there should have been flap loss, and if the damage model would allow, that wing should have made straight flight impossible. However, that's beside the point - point is that thing had a very small chance of being a kill shot.
Morph - remember that snapshot you had on the wingroot of the jug in your spit film - didn't go down yet, did he? Same case, but even though the jug is definitely sturdier than the pony, we're only talking of three hits.
P.S. Come to think of it - even flap loss is improbable since the flap was deployed, thus giving the shell an unclean hit.