Disturbing to see some damage to this site in this video. It appears to be recent and not immediately evident in the photos here (this site) or mentioned by other visitors or on the Scottish Heritage site Canmore. Looking again maybe it is in these photos...
https://www.youtube.com/watch?v=9KlwTcCcvr4
Something is not right. This message is just to keep things from messing up down the road