it's no good arguing about waypoints being moved.
I don't often disagree with you, HD, but I do this time.
Because the crew were not told the waypoint had been moved they thought they were somewhere else. They did not expect to see a mountain directly in front of them - and, because of the whiteout conditions, they didn't! This gave them the impression they were flying in VMC - because they saw what they expected to see based on the flightpath they had previously plotted on their charts!