The way texture hacks work is that they modify your game files. The files on your computer. They just change the way things look in game. No one else can see your texture hack. The only way for them to detect it is to run a crazy deep scan that would take a couple hours to make sure every file is exactly the way it should be. It can be patched by having a HUGE patch that is a complete remake of the textures, this, however, will never happen to mw2.