Nobody did any original research, you didn't discover gravity, and you didn't participate in any historically significant events.
Yet we say that people who have been through education know about such things.
You may know every detail of the American Civil War, from every book ever written on the topic. You may read every journal from every person that wrote one about it.
You do not have firsthand knowledge of what it was like to participate in the war. Any assumption of that knowledge is a (false) generalization of what you think a person “would have thought or felt” based on contemporary ideas of the personality, psychology, etc. Reading a journal entry about a soldier seeing his comrade killed is not equivalent to actually having that experience yourself.
Of course not all works need to be this way, and many, many books are written about war by people that haven't been in it.
The broader point is that LLMs cannot have original experiences.
Stick a camera and a touch sensor on the machine, now it is experiencing the world.
Besides that, there is a lot of value in redigested experience. Quite a lot of history is only really examined in a larger context, where the person describing it cannot have experienced all the original events.
Implication is that virtually none of the novels ever written which include wars are actually original works, since vanishingly few novelists have been in active wars.
Maybe originality just doesn't mean much then?