I think that the wump was wind slab. As i can understand, the guy had a good "I buy a course" knowledge on what is hoare frost. Not sure that it is the reason why the wind slab collapse.
I know I will regret this tomorrow morning.
"we were hit with a large snowstorm that dumped close to one metre of snow over a 48 hour period
The problem here was Storm Slab (or Persistent Slab), not
Wind Slab. There are zero indications in both the report and in the video that indicate this was a wind effected area. It was a steep rollover that triggered on a persistent weak layer, below tree line. Where do you come up with a wind slab
Quite obvious while watching the video. In 3 feet of new STORM snow. You might also argue it was a persistent slab if it was on "hoar frost", or more accurately called Buried Surface Hoar.
LL... if you don't know the difference between Storm Slab and Wind Slab perhaps you should pony up and "buy a course". You might actually walk away with some share-able knowledge.
EDIT: And "local knowledge saying this is safer" is quite different from expert advice
(avi post) listing the danger as 4/5 on the European scale...