I would imagine that someone is having some uncomfortable conversations with EASA representatives about now.
European countries require a "Mountain Rating" for landings at "altiports" and for high elevation landings on glaciers and elsewhere.
Here's an article with a description of the French version of the training required:
https://www.flyingmag.com/bucket-list-alpine-altiports/With two people in that Cub, they may have been training for the EASA Mountain Rating. Or, just hooting around. I've heard that Mt. Rosa is fairly popular for ski ops.
Not exactly on topic, but the skis on that Cub are Rosti Fernandez 8001 retractable wheel skis, which are simply the best skis ever built for that size airplane.