He's right and he's wrong.
Some of the unemployment is structural. But what that means is that enough jobs exist for the people who are unemployed, only the people who are unemployed don't have the skills to do them.
The vast majority of the unemployed don't have that problem. There simply aren't enough jobs for the people who are unemployed. That's cyclical unemployment. (I'll have to find an estimate for this, but from my impression there are 15 million people out of work and there aren't 7.5 million jobs that just can't find someone who can do that job.)
He's right that the jobs aren't coming back, but only so long as people are afraid to invest in the economy, though. He's wrong about the cause or rather, he's trying to point to a lesser cause as the major cause. We won't get the jobs back until the economy grows at 6-8%. With all this idle labor, that increase in productivity should be easy. Even if re-training had to happen, if a business felt the opportunities for growth existed, they would do the retraining. Few businesses are doing that. I wonder why...