Swiveling through Impact is fairly easy to spot. The Back of the Left Hand travels from On-Plane before impact to back onto the Plane immediately after Impact. (AKA. Ben Doyle Hinge.)
The "Release Swivel" is the "Pre-Impact Swivel". I'm merely emphasizing that the Swivel occurs after Uncocking and Rolling. Many Golfers do it before, that's true, but the proper place is Pre-Impact.