I'm guessing he used Lunar Magic to capture these levels. Notice how areas that can't be seen through normal play are shown in the maps, I have used Lunar Magic before, and those maps look exactly like you see them in the editor. Chocolate Island 2 is one of the only things that Lunar Magic couldn't edit, so he must have had to make that map manually.
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Games I have mapped--Zombies Ate My Neighbors (SNES), Mario Party 3 (N64), Super Mario Bros Deluxe (GBC), New Super Mario Bros. (DS), Mario Kart DS (DS)