USGBC's website "Resources and Tools" doesn't state that it's recommended for LEED 2009 projects, but does say that it supersedes version 1.0. The actual document states that it's an update to the original guidance for LEED v2.x projects and is the initial release of formal guidance for LEED v2009.
The November Addenda does include the 2010 AGMBC as a reference (page 2) and in a round about way the AGMBC does allow the 2010 DES Guidance to be used. As far as I can see it's official.
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