nah maybe SL planned to release those zone tracks on other modes than zone, but they scapped the idea and left it there unfinished. vita version removed the track from races, so the game will crash when loading it now from cross play.
i bet the other 3 zone tracks do exist on sl/tt but no one has found a glitch to access them... but they do have leaderboards on tt and sl, but sadly nobody is on those leaderboards

dlc idea for omega :hint:hint