Yeah details are sketchy on this. But from what Matt and Trey have said it was only after the episode aired there was a problem, and it was probably CoS that told him he couldn’t be on the show anymore.

The episode where Chef is turned into Darth Vader kinda indicates it’s something like this if you read between the lines. Weirdly sad episode because you can tell Matt and Trey missed him and really wanted him to come back.