Yes it is possible I don't think it is the case here. The chest up cue, when preformed properly, will set the entire upper and mid back in extension. Most people cannot get their lumbar muscles into extension in the start position, so I was looking for a normal lordotic curve, or a neutral position in your setup. Do you have an awareness of your lower back muscles? Can you do this
http://startingstrength.com/index.ph...sition_control? If you can do that with your lower back, try to do it bent over in the setup and tell me if you feel a difference. It appears from the video the entire back needs to be set tighter. Trying to lift the chest and arch your low back at the same time during the setup should make a noticeable difference.