There is a problem with this climb, the guy with the helmet cam should never disconnect his safety harness lines during the ascent, one point must always be anchored while the other point is anchored above him. In the final scenes you see him clipping it to his chest, then reclipping it to the top of the tower. Then he uses a locking carabiner to make a "safety" connection while he is completed without a visible safety lock, the other guy uses the proper hook. If he's going to use a carabiner the quick attach is all he needs, locking ones are for semi-permanent mounts.
There was a recent safety expose on US TV about the number of falls and deaths from these towers, and this video shows at least why.