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Sounds like a spaghetti monster, but that sentence is phrased kind of backward. The idea is that IF we are likely to become posthuman, and run simulations of ourselves, then the humans in those simulations are likely to do the same, and so on, until there is a large number of simulations. In that case, the probability of us being the very first simulators is very small, so we are almost certainly living in one of the simulations. So I think the point of the above statement is that you can't believe we are likely to become posthumans capable of simulating ourselves, unless you also believe we are almost certainly in a simulation.
Not saying there is any evidence either way, but neither is the quoted statement. It's not really a speghetti monster, more of a statement of the constraints of belief in such a speghetti monster.
Like the Spaghetti-monster, it requires one to take an assumption as a starting-point. It's built on "what ifs". What if these supposed "posthumans" are apes? Like the movie "Planet of.."? They'd eventually be able to run simulations, wouldn't they?
What about the first bacteria? First one-celled life was immortal. Wouldn't it be more simple to deduce that they're the ones running simulations? Where does the idea of "symmetry" in the simulations come from, if not the human psyche and it's arrogance?
It reminds me of a compile-error in code; the classes are built on a circular reference.
I am thinking the core assumption of these scientists is wrong:
Assuming that a highly developed race has the ability to start such a simulation, what would be the point of including the simulation itself, recursively? It would just be an endless recursion, and each recursion step would be less accurate due to resource constraints. I can think of some use to run a simulation of the past, but why run a simulation of the present?
Moreover, at the point the simulants... err, the simulated scientists set up the simulated simulation, they should be able to notice the restrictions of the simulation apply to their own universe. At which point the simulation cannot probably remain accurate, simply because at least some of those scientists will be more interested in contacting their "creators".
The only reason for the "creators" to keep a simulation running beyond that point would be that they're not actually running simulation of their own universe - more likely they're just running a game (maybe "The Sims CLXXII"?)
I read all the foundational literature on that one. Then I couldn't stop thinking about it, and rereading stuff, and forming ideas for adopting the point of view that we do live in a simulation. That fat question gets in the way of much more enlightening and constructive and very interesting thought experiments. I have a constant input into my thoughts on what is this all, and it allows a very patterned view of our experiences, making tweaking that into alternate experiences of reality.