It has the hole, grippyness wont be such a factor.
Given the position of the clip, you can access to hole to draw it with finger through the hole you dont need it to be grippy to get a purchase on it unlike other knives (unless you are carrying it tip-down, and then how serious about it as a defensive tool are you? I mean really).
Once its in your hand, with a finger through the ring, you arent losing it unless you loose that finger, not a likely possibility.
On a non-kerambit design, I'd be screaming about it too, stainless isnt a good defensive knife handle without the ring or close to that level of retention.