1. We have to assume that whoever is simulating us, would choose the laws of physics in a way thats easy to calculate
To our current knowledge this is not the case with our laws, that contain wacky shit like >add infinite amount of possibilitie paths

2. The complexity of the simulation has to go down with each iteration
Consider simulating a single electron to some precise degree
You will need a vast amount of electrons to simulate it
Therefore proposed "near infinite" hierachies of simulations are impossible