I would hope that no-one, not even Haney, teaches anyone to cock his right wrist never mind uncock it during release.
Flipping Nora!
I would be curious to know if by cocking he really mean't bending with a C variation grip - which puts the right wrist bend on the same line as the wristcock. As it would then be correct to flatten out the right wrist as the left wrist uncocks during the release.