Timenudge just makes you see teh world at a different time, it does not affect how the world sees you or how other players see you.

Imagine a car coming at you and you see it 3 seconds 'behind' where it actualy is. BAMM you are hit. you have 3 seconds shorter to register where teh car is and move, with timenudge you can use values to see the car where it actualy is, but because of latency etc you will see it skip, missing out actual frames of its postion.

In short - timenudge does nothing but make your opponents skip, due to unlagged technology doing most of the correction anyway.

Imagine you have a ping of 20 and you set cl_timenudge -30 you are telling your game to draw teh enemy 10ms before it has a chance to get there. so you will skip 10ms of time and it will look like models dissapear.