If your wrist come into play with the belly putter there is something fundamentally wrong with the stroke. The long shaft anchored to your belly takes the hands out of play. If you are using your wrist you are not using the belly putter correctly. Wrist strokes are what cause the yips
I'm not disputing any of that. All I was saying is that it is possible to improperly use a belly putter and get wristy.