they must have a different defination of 'non-partisan' than...

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Maybe so. Then again, it might be a case of access. Whom do you suppose is going to give more access? Minor left-leaning camera hogs or big-time right-wing media luminaries?

Right. Unknown documentarians haven't a snowball's chance of getting in to see the real left and right-wing pundits. It may also be a case of the self-fulfilling prophecy. Mere inclusion of the men identified above so taints the film in your mind that you overlook the other, more valid inclusions.

Looks like your slip is showing, boss.