CBS is still sticking to "Based on what we now know, CBS News cannot prove that the documents are authentic ..."
http://www.cbsnews.com/stories/2004/09/20/politics/main644539.shtml
And to your question, essentially, "yes." They are still playing the official record through the CBS Phoney Philter to make it appear as though GWB obtained favoritism in covering up lapses in duty, and that he disobeyed at least protocol in missing his medical.
That sounds like a lawyered up position. If they admit the documents are fraudulent, it could open them up to exposing their sources and possible legal consequences.