Haha, all this time jon92 was Slim Shady, I never knew that lol

Wassup Slim.
Now, lets get serious here. About the demo - when he first killed that guy at race - I believe it was razors, nothing suspicious there. That spot behind the box is a common hiding place, every time there is someone hiding there. Also you could see Razors' head and arms sticking out through the box.
But then, we get to the part where he goes to the Deathrun. He immediately looks at the guy next to the door through the wall. Normal players keep their aim at the door, but he looked straight at him. When he started chasing him inside the deathrun on top, you could see him following the guy with his aim. I do believe it might be Wallhack, but this demo isn't quite enough, needs a bit more proof to ban him.
About Renegayd's demo - It can be sound, but its also really really dodgy the way he follows them with his aim through the walls, I mean even with sound you cannot predict 100% where the enemy is standing.