If I understand it correctly, they basically say "Our universe is discrete, therefore we're in a simulation". Ok, if "being in simulation" == "discreteness", t

If I understand it correctly, they basically say "Our universe is discrete, therefore we're in a simulation". Ok, if "being in simulation" == "discreteness", than yes, "being in simulation" is meaningful. But why not just argue whether our universe is discrete? Why introduce the concept of simulation, which evokes a picture of some higher level universe with a big computer running our universe. Which is just an idea in our heads, nothing more. "We're in a simulation" implies that our universe is discrete, nothing more, so it's meaningless in a sense. (Other problem is that if we're in a non-discrete universe, we may be able to make non-discrete software. But that's not the main point of what I tried to say.)