Seems unlikely
O.
From your link: "Therefore, according to Ringel and Kovrizhin, classical computers most certainly aren’t controlling our universe."
But we don't know what kind of "computers" might be used. So, similar to being agnostic, I don't believe we can ultimately say - especially if there may be any number of levels of simulation.
And, not sure what difference it makes whether we are in a simulation or not - I don't believe we are. Simulations are only created to acquire information - what would the simulation be investigating?