He's not talking about busing tables.
During Obama there were two million openings in jobs that required certain skills, not from school, not from those acquire working for whatever jobs, but specific to the particular job, requiring 5 to 6 months training prior to working.
This training, of course, would be paid for by the company, but it is training, hard training, tech training. Not the kind of training lesser educated people who just want to stand there and hit a button want to do. That's why they were 2 million of those job openings DURING the Bush Recession.