Skiing is usually used to refer to skiing on maintained ski areas downhill or cross country skiing.

No true scotsman fallacy.

Ski mountaineering is more like skiing than cross-country skiing. It’s quite common in the alps to do that and you almost never go on prepared tracks. The mountain where I spent my teenage winters after school doesn’t even really have an official, prepared track, because it’s too steep.

As I said: you have no idea.

Doing it on foreign terrain which you clearly don’t know well enough and at speed is leaving the bounds of regular skiing.

I ain’t saying it was smart. But it’s not “extreme”.