It seems possible to me that after passing some threshold of metaphysics insight, beings in basement reality would come to believe that basement reality simulations have high measure.
Past a certain point, maybe original basement reality beings actually believe they are simulated. Then accurately simulated basement reality beings would mean simulating beings who think (correctly) that they are in a simulation.
I don’t know how to balance such possibilities to figure out what’s likely.
Interesting idea. So I guess that approach is focused on measure across universes with physics similar to ours? I wonder what fraction of simulations have physics similar to one level up. Presumably ancestor simulations would.