Is that a legal campsite?
The campsite pictured is a legal one and part of the official campground. It is indeed a fragile area, so maybe the campground should be moved farther down the valley.
The tent almost surely did blow away. Same thing happened to us last year, but we didn't leave the tent unattended and retrieved it, though the poles were damaged and the tent ripped. Kite Lake is one windy campground. I wouldn't try camping there again without a 4-season tent.