This technique is awesome and works really well. I had carpal tunnel surgery 25 years ago and my wrists still get 'locked up' every so often. I used to just pull on them, but adding in his technique of turning your head to the opposite side makes a huge difference in how my wrists feel afterward.
Try it -- you have nothing to lose but pain and that annoying feeling of 'offness'.
Note: The real instruction begins at about 4:30 -- you can skip all the narrative if you just want to see the technique. :)