What you write cannot be true or the American Eagles guys wouldn't have died (along with the passengers) at Rose Lawn.
For the purpose of this discussion the fact that the aircraft was well iced up is irrelevant. The point is they had flap 15 selected and stalled and lost control when they raised them. They'd have had a chance if they had reselected the flap.
Ergo, the AoA of the wing with flaps extended is less then the AoA clean or it wouldn't have stalled.
And I wasn't talking about steady state cases. All parameters will begin to change during the flap travel until reaching the new steady state case values.