Damage control.
DF was about to leak the actual XDK that was way lower than actual 6TF target and MS intervented giving them the full TARGET specs.
Why TARGET? Because I don't believe they have a machine running at 6TFs right now... they are optimizing the cooling system and waiting a better silicon production to reach the 6TFs in June.
The video today basically confirms they don't have 6tf dev kits right now. Forza 6 demo used "cobbled together" production parts. So it was probably 6tf but not in a near finished state.