He put this in various forms, including the point that Bush and Blair talked about slightly different subjects. I didn't hear Blix say that the "24 hours for a commitment" message was not held by all of the participants. He was picking nits as to what the commitment contained.
More importanly, Blix really is irrelevant at this point. The players under the deadline are UNSC and Saddam. If UNSC is not forthcoming with a clear "disarm NOW" resolution, backed by force (it won't, France already promised a veto), diplomacy is over. Period.