Lol! Actually, I DID know that! I read an article about it in Nintendo Power's 100th issue! But, it's really a matter of opinion whether Subcon is a Super Mario world. I can see both sides of the issue, though. It could not be because of what you said, but it could be because hasn't the game been rereleased several times since then? Meh. I guess it could be viewed either way, but I still see it as a part of Mario's history, and therefore, it's a world of his. So, it's fair game.
Thanks for not attacking me with that info, BTW, especially cause I already knew it!