FALacy, weather the video is real or fake the point has been made.
I don't think the point is moot that it is a rock chuck and not a human. Most calibers would be capable of the same carnage on such a small animal.5.56 will essentially grenade a squirrel, and it obviously doesn't have that effect on humans.
I guess there are just too many factors that come into play here. Is .50BMG capable of destroying a target as described? Yes, I guess it is under the right set of conditions. But under another set of conditions it may perform marginally, as stated above with the gut shot goat.