If you read it, you'll see where it says minimal partisan bias. FYI, just because a person or a publication has a bias (let's face it, we all have them), doesn't mean that the reporting is false. 100% of documentaries are slanted to some degree, no matter how hard one tries, because someone chose one topic over another, to interview particular people over others, and to place the camera in a particular position instead of others. So asking that question is rather moot. There are facts, sure. However, reporting some facts while leaving out others shows bias. The best we can do is to find minimal bias and that's what this chart does.