Apparently, this is some new technique used by the Chinese. I have only seen this one person do it. She uses a wide grip which results in the athlete having a higher contact point on the body and to pull the bar higher then switches to a regular grip. Unless you are an experienced weightlifter, don't try this technique. Moving your hands while the bar is in motion can be dangerous.
I have been working lately on having a higher contact point so I can minimize drag and have a faster turnover on the bar.
What do you do to pull the bar higher?