That video is more about the game timer, not the camera speed. I hesitate very much to say this, and I fear for a karmic blowback, but I think Vedui was a little confused at about 1:30, referring to the God speed and Shift-= and Shift-<minus>. He says that on his keyboard it is the numpad +/-, but what that actually controls is the game clock which just slows everything down (as he shows).
From what I can tell:
"God Speed" = Shift+= and Shift+<minus> (next to backspace) = camera speed (and really it's only working properly for the detached camera)
"game timer speed" = NumPad +/- = slows down all game operations AKA "slows down time"
You can get some slow cinematic tracking shots using the game timer, but since everything else slows down also it's not too useful for recording videos of normal game play (like the Neebs' Gaming video). For that you need the God Speed controls and the detached camera.