Yes, he did say it, in front of a town hall full of people. The
transcript of the event is here, and that completely false statement is toward the end.
Here's how Andy Card (W's chief of staff) described what happened:
source
Multiple people have confirmed that there was no television outside the classroom, and of course there was no footage of the first crash on any network anywhere until September 12th.
Not to sidetrack the discussion, but there are at least 7 different versions of how exactly W learned about the first plane . . . which tells me (not a CT) that in trying to reconstruct events that happened just BEFORE a big crisis, you're likely to get a muddle of versions.
In this case are abundant examples of such muddles. The English women's recollections about their evening, AK & RS's recollections about theirs, the recollections of the postal police about their arrival at the cottage, and so on.
But only AK & RS are on trial for murder.