An important question is how do we know what is true, a real fact, not changed history?
In more depth, when a person from 200 years ago is quoted how do we know what they meant? They do not have the insight we have today and we use our insight to evaluate what they said. It will be up to the AIs to sort that out. We could build an AI that has only the knowledge available to the person from 200 years ago and see what we get?