A0283, yes, but "overpowering" the AP would be unvoluntary disconnection as well, i.e. not a normal way to disconnect the AP. But I guess it should not take more than 2-3 sec (I don't know the exact force required, it might be in some maintenance manual, but I don't think its more than 3 or 5 kg or so...). But as others have said I think it highly impropable that some sort of incapacitation caused this event (the aircraft is protected,in normal law the only way to overload the aircraft would be through massive rudder inputs...)