Do people who say “past history” realize that it’s really the only kind of history there is?

Wrong
There is future history

Future History: A future history is a postulated history of the future and is used by authors of science fiction and other speculative fiction to construct a common background for fiction. Sometimes the author publishes a timeline of events in the history, while other times the reader can reconstruct the order of the stories from information provided therein.

Hahaha like revert back

Isn't that a double negative ? If so what they are really saying is ,tgey dont have a history.

True and history is simply his story! 🙂

Assuming time is linear you are right.

Redundant, like “repeat it again”.