he does them absolutely horribly wrong.. I'm pretty sure if u keep that up you can injure your bicep tendon. He's doing a semi upright row, when it is really supposed to be a CURLING movement.
Basically you CURL the bar up along the body in a straight line; this requires that your elbows move back, but NOT up. If your elbows/shoulders are moving up then you are doing the exercise WRONG.
A Drag curl done right is 10 times harder than a regular curl, and a very efective movement for the biceps.
ps- the top portion of the exercise is very important, as this portion allows for PEAK CONTRACTION, i.e. it is the hardest portion of the exercise and this is what the exercise was modified to allow for. So pay close attention to the top portion and do it right.