One thing that stands out in my memory is multiple different teachers always drilling into us: "never trust photos" (you don't always know who took them, for what reason, and if they were real or staged or whatever)
If 12 year old kids are being taught this, I don't think future historians will be fooled by a pretty photo. It is not like people have been unable to generate imagery of non-true stuff before - CGI in films (and also games for that matter) have been pretty close to 100% realistic for some time ... no one is complaining that future historians are going to confuse the scenes from The Matrix about what really happened in the 1990s. The barrier to entry is lower now of course, but I don't think that changes the position: you cant trust a photo.