I remember that being in the episode of LordKaT Live where they brought this up. According to a Mr. Dugan, they call it "the cold record" because of the lack of tone
This is part of why appeals courts in America don't generally second guess the jury on factual findings, even when they might have found differently based on what they're looking at in transcripts, which is how they usually experience the trial. The basic standard is that if the record contains material that supports the factfinder's ultimate conclusions (whether that is jury or judge), the facts will stand.
Even when there is video or audio the transcripts were based on, it's generally considered that the jury was actually in the room and watched the witness, including their general demeanor and facial expressions and other subtle social cues that an appeals court can't guess at. This is sort of the core of the concept of a "jury of your peers." While in ancient times that literally used to mean a jury of people who were personally familiar with you in your village and probably personally familiar with the facts in your case and, obviously, this is now completely different and those people would be exactly the people who wouldn't be on your jury, it still does mean that a jury is comprised of people of your society who are capable of looking at you in the eyes and judging your testimony.
In this case, though, I think the general principle stands. Not only the words of this defendant damn him. His shitty body language and evasive eyes just add to the actual terrible things he was saying under cross examination. The plaintiff's lawyers brilliantly got him to do something that has been the undoing of many a defendant: telling the truth.
The truth is this guy is an awful fucking human being.
However, there's specifics to that, too.
Here's this video again.
I post that specifically because, in addition to his shitty demeanor and coming across as a complete douchebag, he also agrees to the fact that he didn't care whether his journalism was more a "morbid and sensational prying into people's lives" rather than a real news story. This is where the "cold record" part comes into play (it's around 1:30), because that's literally the language from the court's instructions to the jury about the legal issues in the case.
It's also a great example of how shitty a job Gawker's lawyers did because even a flat out sociopath, as Daulerio seems to be, wouldn't directly agree with a question that practically amounted to "so are you guilty?" Whoever did the witness prep on that should be taken out and shot, or assigned to defend child molesters for the rest of his life.