I updated Production Company at SHOW level. Do I still have to fix it at every episode?

I am doing a series-wide update on episodes for a COMEDY CENTRAL show from 2002-2004. The show is Tough Crowd with Colin Quinn: https://www.imdb.com/title/tt0357399 -

I submitted an update for the Production Company at the SHOW LEVEL recently: 260611-024959-053000, because it was coming up as "Central Productions Ltd." which is a mistake, that is a UK entity with shows like THE HIT.

The show I'm looking at aired on COMEDY CENTRAL, and I provided evidence that the Production Company (copyright) was "Comedy Partners," so I submitted to REMOVE the wrong one. And ADD the right one.

It appears the change was accepted, but at every episode where I am adding episode-specific info, I still see the old Production Company appears: "Central Productions Ltd."

Do I need to update per-episode? Should I have submitted it as a "changed" production company instead of remove/and/add ? Does the change need to be "PUSHED" to ALL Episodes ? Does it take extra days and weeks to trickle down? Please advise. Thank you!