Why is it said that the economy is healthy with 20 million unemployed?

Interviewee: Good news and bad news.
Reporter: You know, it seems like every month, I interview someone like you on the first Friday of the month, and they say, good news, bad news.
Interviewee: That’s right. There’s a reason for that, the good news, 200,000 jobs in a month added. That’s great. The bad news, the level of pain out there has not changed. There’s still about 20 million people who are either umemployed, working part time, but would like full-time jobs, or not in the labor force, but would like to be in the labor force. That number is just stable, and it’s a lot of pain.
Reporter: The unemployment rate stayed constant, but that’s because we added 200,000 jobs, added 200,000 people to the labor force.
Interviewee: That’s right. But think of the population and think of the number of people in the population who are workng. That tells you how healthy the economy is, how good the job market is. That number plummeted in the recession, and has barely climbed back up. We’re not at pre-recession on levels.
Reporter: Indeed the so-called employment-to-population ratio has been below 60 percent for five years now, down almost one-seventh from the ratio pre-recession, to a low last seen in the Reagan recession of the early 80’s. Now, the economy is adding jobs. In fact, May marked a milestone. Five years after the end of the great recesssion, we have finally regained the nearly nine millon jobs that were lost. But Osterman, who has researched the quality of the new jobs, says they represent no progress in wages for the economy as a whole.
Interviewee: Twenty to 25 percent of all adults who are working are in poverty level jobs, jobs that if they worked full-time, full year, wouldn’t raise them above 125 percent of the poverty rate for a family of three.
Reporter: In May, for example, some of the biggest job gains were in health care. Seems promising. Yet many of those jobs are low-paying.
Interviewee: Health care is very bifurcated, polarized industry. You have got the doctors and nurses at the top. You have got the home health care aides. You have got CNAs, the certified nursing assistants, at the bottom. These bottom jobs are going to grow immensely because of the retirement of the baby boom, because of the demand for home health care. And so a growth in health services, while expected, doesn’t necessarily lead to better jobs at all.
Reporter: "Consider the entire economy", say Osterman, "and what the average job has been paying. "
Interviewee: If you look at wage growth in the economy, over the last 12 months, it’s been about 2.1 percent. That’s barely ahead, barely ahead of inflation, so people are not going ahead in terms of their earnings in this recovery.