I'm not sure what you're trying to get at here. The video clip of Colbert with the CNN host speaks for itself. The audience's spontaneous and unintended reaction created an awkward moment. One is free to disagree with the Breaking Point hosts take on things.I think you're being misled by the edit here.
Any edit like that should make you suspect, since he was clearly cut off mid-sentence, so I went and watched the interview clip.
The "CNN is objective" is just boiler plate "don't attack the guest" patter to get to the real question, which was about how despite the official "objectivity" they still have their own feelings and their own bets about what happens and did they anticipate Biden dropping out.
It's throat clearing and signalling it is safe to answer the question he is asking about the behind the scenes thoughts and that he won't use any admission there as an attack on their purported objectivity.
Yes, he didn't think it would result in a laugh line from the audience, but "he's clueless" doesn't seem to track, really.
When someone tells me there is video evidence of something else happening, I'm like "okay where is it?".