Galaxy Flyer,
The article you posted was dated 17 January, so Hershman obviously did not say it today.
Chairman Hersman of the NTSB stated today that non-pertinent conversations with the jumpseater may have played a role in the approach and landing. This isn't gonna be good, you can take that to the bank.
The article only says that they are looking into whether there were improper discussions in the cockpit. Of course, they would check the CVR for sterile cockpit violations whether or not a there was a third person.
Hersman said during an interview on CNN that aired on Thursday evening that her agency was investigating the possibility that the pilots of Southwest's flight from Chicago's Midway Airport that landed erroneously at a small airport in Missouri were discussing something unrelated to the flight they were operating, which was supposed to be destined for Branson, Mo.
Since we haven't heard anymore about it, I'm guessing the NTSB didn't find anything on the CVR.