If that's the guy I've seen before he often comes up with clever ways to shoot arrows/use bows.
I'm not sure if that device would be legal for archery here or not. There used to be a provision that dis-allowed anything that would keep a bow at a draw other than a person holding it but it appears that was removed from the regulations when crossbows were included as legal archery methods.
Now under methods allowed it only lists hand held string releasing devices as allowed and somehow I don't think that device would pass that criteria. I don't think I'd try it for hunting without clarification.
For hunting purposes, that system is way to loud. Every deer within 100 yards will be on alert after the draw.
Second issue is, the bow he is using is a kids beginner bow. It probably doesn't have any more than 25 pounds of draw.
It would be interesting to see this thing on a full size hunting bow drawing 60 plus pounds.