The point is that "journalists" have ethical guidelines they have to follow. Failure to do so compromises themselves and their profession. It leads to the defense and promotion of "fake but accurate" articles that tell a great story but risk being just that.. stories.
It's the equivalent of asking Hillary Clinton's opinion of Donald Trump. She may be 100% accurate in her assessment but she is not neutral or impartial.
This is a very naive view of journalism. It is trivial to do horrible, biased reporting while printing statements that are factually true or not falsifiable. In fact, that is how most of the biased articles are constructed these days. In the age of the Internet you can't get away with outright lies. The tool of trade are mission, misrepresentation, manufactured context, selective citation, cherrypiked expert opinions and so on.
You’ll notice that Carney never disputes the truth of the claims. He only attacks the character of the people who made them- or adds related but not contradictory details. Overall, side issues not actually related to the substance of the claims themselves.