You are not the first to be confused by this, when I first saw it, I was confused also. All you have to do is hold "r" at the start of the Crappy Random Stages and that changes "edwin's farm" and "roundabout" to a rainbow version. If you are curious about anything else, you can always ask questions in the LK8 Speedrunning Discord here: https://discord.gg/RSX2Er8