I don't think you quite understood... If someone is casts clone successfully and you use desecrated ground, then nothing is wrong. If you cast desecrated ground just before he casts clone, then clone will be successful in the sense that the DK can't be cc'd/dmged/slowed etc but can still play normally.
Video that Noneedholy posted a long time ago: http://www.twitch.tv/sazzieu/v/19593801
As you can see, just before he clones Udaku (Absolutezero), there's a desecrated ground on the stairs (about 15 seconds, you can see it above his hp bar). Now from then on fourth, he's immune to every other cc but he's still pewpew'ing.