What I mean is, nothing about the stories of the survivors would indicate that these pointy-eared, green-blooded people were Romulans.
Perhaps, just perhaps, the survivors would have been eavesdropping on the conversation aboard the Narada
(although we only have proof that they were monitoring Robau's lifesigns). But nothing discussed there indicated the origin of the attackers! At the very best, our valiant sidekicks might decide that these people were renegade Vulcans of some sort, but they probably wouldn't make the connection to the old war with the faceless enemy.