Simulation it is not. However, there is a second option to review reality.

Matter is the secondary reality, while the first reality is not readily visible.

What we can say with certainty about the first reality is that by producing the second reality, the first reality can no longer be the same it was before.

I do not wake up in someone else's body; I always wake up with the same body. Same is true for matter: it is self-based. As such, a simulation it cannot be because it would then be a self-based simulation which is a contradiction in terms.

Yet by placing our material reality in second place, and by declaring the first reality as also incomplete by default, then we have an overall reality that does not have a nice clean answer.

Two realities at the same time, and neither is in the lead.

Dark Matter Explained:

https://medium.com/carre4/dark-matter-explained-7e6276a7c224