Vibration is not "just vibration" as there are many differen frequencies that will result different net results.
This test has far to low of hz in vibration to be comparable to that of a bow... The test is not up to par bc it is not realistic. The vibe frequency is MUCH higher out of a bow, so this is like testin these products in a totally different field...
It is indeed a neat test to watch, but is not an accurate representation/recreation of a bow fired upon the shot.