[Serious] Is the Past Real?

[Anomalocaris]

I have to wonder if you can have a theory of causality consistent with denial of the past.  I don't think it's necessarily the case that causality as a concept has to survive, but if it's a fiction, it would be one of the more difficult fictions to give up.

it seems to me a theory of casualty unchanged from how we normally understand it works perfectly well in the scenario where our perception of the past is all the artifact of a computer simulation which creates illusion of causality, but the computer itself resides in a real world with an real but entirely different past which we can not perceive, but which also follows the same nature of causality.