In reply to Misha:
> A bit of trivia to supplement the video, which was filmed on 2 April this year - the Saturday of the Easter weekend.
Some more related trivia from me...
> As can be seen in the video, it was a fantastic blue sky day.
We did NE Buttress the same day and it was indeed glorious, but we were still greeted by a temporary deterioration to near-whiteout conditions in a chilly, rising wind on our (presumably much later) top-out.