Question: How does the anti wall hack work - and does it affect gameplay?

I understand that detox's anti-wallhack is a server side plugin which removes the positions of opposing players. But my concern is if it alters in away the gameplay? Will players still be able to hear the opposing team behind a wall? How can you get the footsteps of a player behind a wall if you don't have their position?
-glock

The footsteps are simulated seperately from the player positions, so there is no effect on the sounds of the players.