The article attempts to provide arguments in support of the proposition that the universe as we know of is not a physical reality, but a simulation. It does so by showing how various mysteries of universe like dual nature of waves, uncertainty, quantum leaps and so on, naturally occur in computer simulations. The paper provides quite in depth and convincing arguments for comparing the two.
The author, however, ignores a very fundamental limitation of simulated entities, which seems to invalidate everything. that the paper proposes.
Entities in any simulation, however intelligent, have no way of knowing about the environment in which they are simulated or the fact that they are indeed in simulation. Further, as the article also emphasizes, whatever they observe is a result of the environment deliberately created by the creator of the simulation. So if we in this universe are observing any phenomenon (as an example the uncertainty in quantum mechanics), it is primarily because our creators want us to see it that way or a result of a detail they did not consider important to their simulation or something else on these lines. It can’t be considered a reflection of the environment in which the simulation was created.
As a simple example, every simulation on a computer is time multiplexed as almost all computers employ multitasking. It is clear that the simulated entity can never know this and the fact that it and the whole environment it lives in ceases to exist periodically (does not get cpu cycles) and it is implemented on a silicon hardware.
In conclusion, this article, even though being very scientific and logical, does not provide any support to the argument that we are living in a simulated reality.