Halo 2 old maps modder, thats not even possible

http://www.bungie.net/Stats/PlayerStats.aspx?player=II%20NoNsEnSe%20II&mode=Halo2

 Wow, so apparently this kid has figured out how to mod the old maps. I dont have to worry about it because I dont play ranked. But my friend ran into him on Team Slayer on beaver creek. And he was super jumping and running super fast. Have the modders evolved? I didnt think it was even possible for modders to mod old maps.

You can Mod on old maps 

 I get modded on midship all the time...