Sounds like the survivors had a lucky escape:
https://www.telegraph.co.uk/world-ne...lides-off-alp/
It's behind a paywall but the paper is reporting that a locally-based English guy in his late 60s; had the foresight to push two young English guys out of the door as the helicopter began to slide. He ended up down a crevasse and was located by his avalanche transceiver. The two lads ended up sliding down the mountain in the avalanche but were rescued.