No, the 2pi version was changed as well: http://www.xbox.com/en-US/games/t/theelderscrollsIVoblivion/default.htm
Rerating games based on 3rd party patches is pretty ridiculous. You can't see the files normally, and you'd pretty much have to be trying to use the mod. Plus, as one of the announcers of the PC Gamer podcast said, any kid enterprising enough to be able to install the mod is capable of seeing far worse online. The announcer also suggested making a mod for Harry Potter which replaced his iconic scar with a female nipple, notifying the ESRB, and seeing their reaction then.