With all due respect, that just sounds like someone saying that the graph needs to align with one’s own views to make for it to be credible. If that’s the case, who or what can be said to be objective?
But I get it. It’s convenient to rail against “left wing media” if you can shift everything that you don’t like to the political alignment that you don’t like.
Oh, I don't find those things to be credible anyway. Labeling media organizations on a political spectrum is absurd. Everyone's own opinion is, ultimately, all that matters to anyone. If you accept this graph as is, all that means is you agree with the views of the person who put it together, or you are deferring to their judgment. Either is fine, but both are fundamentally meaningless.
The question is, who can ever be truly objective? My goal is not to balance my intake of different media, my goal is to not take anything for granted, particularly that what I'm being told is true. I'm skeptical of any new or unvetted information, even if it confirms my bias, because I don't dismiss the notion that someone could be trying to exploit a particular bias in order to mislead people, or force a particular agenda.