From your link to the Washington Monthly:
As for Atta, is it really possible that Weldon put up a gigantic chart in front of a big crowd at a Heritage event for half an hour along with the passionate claim that our intelligence agencies were completely inept for not acting on this information but failed to mention that Mohamed Atta, the most famous terrorist of our time, was named on it? Furthermore, that no one at the event happened to notice Atta's name on the chart?
It is hard to disprove a negative. I don't know what was on this chart (Weldon said it was the unclassied version during his presentation), but the fact that two military members of AD and the contractor who supplied the photo state that MA's picture was on the presentation they developed for SOCOM is good enough for me. Anyone who has watched the video understands the context of the chart in Weldon's presentation. He never said it was the same one that was used for SOCOM nor did he go into any great detail on what was on it.
Schoomaker... and most of all Gen. Hugh Shelton who ordered the group formed in 1999 would be the people to question.