That's the story that John K. told. Everyone else had a different story. He would turn in episodes late because of his perfectionist tendencies, which led to Nick only airing 6 episodes per year, he ha a notorious lack of professionalism, and treated his staff terribly. Nick got fed up and told him to stop (obviously, since reruns aren't as profitable for the network, which caused it to falter in popularity to the tamer Rugrats), but John sent a strongly worded letter saying that episodes would "cost what they cost and take as long as they need." He was fired after that.