Roger, I never trust anything they list at TV.com. I just don't consider them a verifiable source of information. While Wikipedia isn't much better, they do have a list of all of the episodes for the series. G.I. Joe ended with Season 2, at least the class animated series did. There were future series based on the characters but mostly having to do with various specially created animated releases that were given away with various G.I. Joe vehicles that you could insert your figures into.
Season 2 will be the last for me, with G.I. Joe, simply because I consider that the end of the classic series. The same reason why I feel about the Transformers series. While I'll be picking up Transformers Season 3-4 set, it's just one of things I'm particular about.