Yeah I agree it may not be the best place for the release but that is where it is. I know where it is on mine and I conciously think of that EVERYTIME I practice pulling my gun. Should it matter where the release is? Isn't one of the basic rules of firearms to not have your finger on the trigger until ready to fire?
The gentleman in the video was not an older man with arthritis or some other crippling hand disorder. There is no reason he could not release the gun and then straighten his finger. Since I saw this, I have practiced drawing and find it difficult to not straighten my finger.
Movement of the fingers occurs very fast and maybe if people played more video games or played a musical instrument they would have better finger control. (I do both...