The whole point of the 9/11 commision was to white wash the Clinton Administration.
Just like that, they wave it away without investigating it any further. There could be many reasons why the dates and time didn't match -- how about using different passports for starters. Atta's name itself most definitely deserves further scrutiny -- but noooooooo they didn't like the dates so they just wave it off.
In translated Clinton speak, the quote above in bold should read:
"This information did not fit in with the conclusions we reached before the commission ever got started."