You have two different stages.
2D - Seen from the match, during pre-match pyros, and when the camera pans before the match. This is what most people hack and mod.
3D - Seen during the entrance taunt, and while fighting on the stage.
The code eliminates the 3D stage, and overlaps it with the 2D stage. This will allow people to mod their normal stages, and load them over the 3D stage, allowing the wrestler to do their entrance taunt in front of the modded arena stage.
It isn't the best code in the world, but it gets rid of that pre-match entrance taunt that throws off a whole project. Like the camera panning in front of the WWE Raw arena, and John Cena comes out and salutes the crowd of a WWF Raw stage.