A "primary source" also isn't in any way immune to rational inquiry. I don't mean for this parallel in any way to imply a relationship, but just look at our administration or any one of innumerable other examples to this end. Taking something at face value, to me at least, requires more than a decontextualized statement of fact when my immediate impulse is to question it (in this particular case).
For instance, define "job". Are we talking about a recommendation leading to a project for a contractor, or are we talking a full-time position? I mean, that's just the start. In what ways are they determining what constitutes "finding a job"? Talking to friends and friends of friends? Or directly messaging a corporation's page on Facebook?
There's a lot of squish here and I wish they were more forthcoming about what that statistic actually means.