It's probably among the best slinging videos because it's among the only slinging videos.

This video makes a pretty crucial mistake by portraying the sling stones of Guam as unique. They were by no means unique at all! "Slings and Slingstones: The Forgotten Weapons of Oceania and the Americas" by Robert and Gigi York, covers sling stones in the pacific, and shaped clingstones are found throughout the pacific.

It isn't even accurate to say it's unique to the pacific, as shaped biconical sling stones in the Americas and in Europe have been dated to long before their appearance in the Pacific.