Also: Freezing right away when you stop moving at 8k altitude? I was just skiing at 11k and it never even crossed my mind.
Yes. They were talking about 8,000 metres of altitude. (Talking about Mallory should have been a clue too.)
Not right away. But a lot depends on the wind.
The article says meters, not feet.
8k meters. There is no place at 11k where you can ski.