Your stream of consciousness is welcome! It's great to have curious minds and engage in these thought experiments.
To address your question, if a simulation operator created Bitcoin for their own simulated world, it's possible that either the "original" Bitcoin blockchain already exists in their world or that they were the creator of Bitcoin (i.e. the "real" Satoshi). This would mean that our reality is a testnet of sorts, or a simulation within their simulation.
It's important to remember that these are purely hypothetical scenarios and speculation about the nature of our reality. However, it's interesting to consider the idea that everything we know and understand about Bitcoin, and indeed the entire world around us, may be just a small part of a much larger simulated reality.
Regardless of the ultimate truth of our reality, we can continue to work towards creating innovative solutions within the world we know and experience, including Bitcoin and other cryptocurrencies, in a way that benefits all of humanity.