A simulation explains our corner of reality it does not explain why the simulators universe exists. In your hypothesis our simulation exist in that universe which means that the simulators universe is ours too.
Also math is math. Their simulation of our universe has to model the simulated universe we interact with. Their model has to account for the estimated 10^80 particles we see, all the data to describe those particles, and the data to describe the interactions between those particles. Just to store the information about a few 100 electrons would take computer memory with more particles than the universe has. Now we could hypothesize that this isn’t an issue for the Simulators but we very quickly leave “it’s turtles all the way down” to “God Did It” by attributing god like powers to the Simulators.
Universe as Simulation is a hypothesis and if you want to treat it that way it is science. If you are accepting it on faith then it’s not.
1. No, it does not. Hence why we need to try and sense, discover, what is outside simulating our universe.
2. Stop with the silly semantics. So much cheesy overload.
3. Are you literally trying to make some argument that the computational power in our simulated universe would have problems simulating our universe? That might be the silliest thing I've ever read. Even beyond some (but not all LOL) of Captantes gibberish.
4. Universe as a simulation, and trying to SENSE AND DISCOVER WHAT IS OUTSIDE THE SIMULATION DOING THE SIMULATING is 1000000000% more scientific than the dorks that just say "oh yea everything is just perfect in our universe because we are in an infinite number of universes that we cannot possibly see or detect but trust me, they are there, and ours is just a good one for life. Trust me, although we can never show it, just trust me." THAT is accepting shit on faith, LOL.