They can experience time non-linearly. Consider this fact doesn't change their current action as their decisions has already been made as time progression does not exist in sense we perceive it.When it is said 3000 years later , what is meant is linear way time is perceived by humans.There's small conversation with Amy about would knowing alter your actions and decisions ? She answers No ; that is more baffling and stupid. She can't as when time can't be continuous , consider a discontinuous graph where none of points have natural progression everything is as whole already existed , you can traverse through it as experience , sift through it ; but whatever you visit already exists and if you come back (backtrack) you have more information but outcome isn't going to change when you visit the same point again.