I think his point here isn't that the skills aren't useful it's that so many folks feel like you MUST PROVE something in a relatively benign context.
I understand that, but you don't have to stick your finger in someone's eye, break a limb, or hit someone in the throat in, relatively benign context to know it works. There are reasons the things people would do in a life and death situation aren't allowed in the ring, so I don't see the logic of the arguement