The guy didn't notice????
If that is possible then it truly beggars belief. When I heard a Cessna clip the fuel bowser at a small airfield years ago practically the whole place heard the bang. Travelling at 100kts or whatever it would have made a hell of a noise.
Add to that the ongoing wind noise from the damaged wing, reduced control effectiveness, vibration and drag from the damage, not to mention loss of fuel, and the suspicious lack of wing whenever you look out the port window, it is just about impossible not to notice for several hours.
Whatever the reason this guy chose to continue, it has more to do with other human factors than non-perception!