Because the information that made it through from loop to loop didn't seem to be complete. Indeed, most of the information that was crucial came from several seconds or minutes before the collision, and nothing from immediately after it - except for "abandon ship", I think.
IDK - Data said he isolated relevant parts; but come on - they couldn't get the audio of the final orders before 'abandon ship'? (Hell, he was able to count how many of the crew were doing what in his first sample pass in Main Engineering.)
It's just more of Mr. Braga's hackneyed writing.