Don't know what Channels DVR StationID "12553" maps to on their site.
So far I've only found it on their site using Satellite "C-Band - Satellite (USA)" G6-09
NASA TV's site says they're on Galaxy 13 https://www.nasa.gov/content/nasa-tv-on-satellite-galaxy-13
I sent zap2it feedback through their Contact Us form https://feedback.zap2it.com/tvlistings/ a few weeks ago. I never have any luck with that and only get their robotic reply they got my feedback.
I assume it's the same feed based on EST for anyone in the U.S. no matter how they receive it?
Maybe some poor soul there is scraping their pdf schedules and scrambling up the result. Among other bad data, the Channels DVR and zap2it schedules shows a replay of a launch that wont happen until next Saturday. Now, if they could only do that with Lottery results, I wouldn't be complaining!
Per https://www.nasa.gov/multimedia/nasatv/schedule.html
Nov. 14, Saturday
3:30 p.m. – Coverage of the launch of the SpaceX Crew-1 Mission on the “Resilience” Crew Dragon to the International Space Station (Mike Hopkins, Victor Glover, Shannon Walker, Soichi Noguchi). Launch scheduled at 7:49 p.m. EST; coverage will be continuous through docking and hatch opening on Sunday, Nov. 15 Kennedy Space Center/ Hawthorne, Calif./Johnson Space Center (All Channels)