Except, no, that's not the case at all. A job position being open doesn't mean no one wants it. That's ridiculous, and you're not going to be able to support it as a valid point, because it's not one. This is a case of lazily using a statistic to support an argument it doesn't directly apply to.
The reason there are so many unemployed people despite the presence of jobs—which will always exist, since people will be fired, could quit, move, get sick, die, or go through any number of other things—is because there is a greater amount of unemployed people than there are openings.
http://www.theatlantic.com/business/...enings/276787/