[PeterisP]

An interesting point is that limitations on math (i.e., things that would be true regardless of the details of the physical world) would put limitations on any physics simulations - including hypothetical physics simulations done by someone outside of our universe with potentially different physical limitations.

So the point of the article is something like - if phenomenon-X can't be simulated by anyone, no matter how good their computers become; and if our universe is a simulation (which is a possibility), then our universe won't contain phenomenon-X.

[TheLoneWolfling]

The problem is that there is no proof that there is any such thing as something that would be true regardless of the details of the physical world.