Well the general reasoning is the timeline was slightly altered when the Ent-E when back in time in First Contact. So maybe Data did see Archers report in Q-who in this timeline, eitherway it would not have changed anything event after Q-who if they knew of Archer's experiance with them or not.
Still I think there was sometype of cover up (Section 31 perhaps?) because we also have Voyager screwing things up with 'The Raven' (as mentioned above) showing us that other people new about the Borg years before Q-who. Even in TNG the Borg may have been around before Q-who with the planets in the Neutral Zone getting trashed.
Of course know we are in the Abrams timeline so if the Borg come back the only 'valid' history will be from Enterprise . I'm sure some people would live to see how Kirk and Spock deal with the Borg.
Still I think there was sometype of cover up (Section 31 perhaps?) because we also have Voyager screwing things up with 'The Raven' (as mentioned above) showing us that other people new about the Borg years before Q-who. Even in TNG the Borg may have been around before Q-who with the planets in the Neutral Zone getting trashed.
Of course know we are in the Abrams timeline so if the Borg come back the only 'valid' history will be from Enterprise . I'm sure some people would live to see how Kirk and Spock deal with the Borg.
