Energy can't be created or destroyed. Because of this intuition tells me that it's NOT a simulation. If simulated it would seem matter/energy would be able to be deleted so to speak. For example; a hard drive with Minecraft installed on it. You then create a block, then delete the block, comes from nowhere and is destroyed into nothing. Minecraft is a part of "our reality" therefore plays by the same rules, but like a Russian doll an illusion makes it appear as a separate reality. A reality where a  'block" does NOT transfer or transform but is created and destroyed. Or perhaps the block is always there and never there at all times within data that is not created or destroyed. Some things are unknowable.