It's cannon until the current Clone Wars cartoon amends the Attack of the Clones connection / end of the Clone Wars story. Well see if they go there when the show ends. The official site removed much more then just Tarakovsky's contribution to SW. He's being a little dramatic, you can't have all products getting face-time at the same time. But it is a semi-practical way to get people to remember it.

From the SW.com panel at C6, the official site is attempting to roll back into circulation many of the old SW video projects. The Ewoks and Droids were definitely mentioned as getting put online and the HS was nudge nudge wink winked. Now we wait to see if it actually happens.