The article mentions the possibility of communicating to those who created us, which, if done, would be irrefutable proof. For the religious among you, what would you do should it be proved irrefutably that we are indeed inside a simulation?
I already have proof that God exists and the Bible is true. Unfortunately this proof was given only to me. I can tell you my testimony but it is up to you if you believe me or not. But for me I am 100% percent sure that we are not in the matrix.
So if it would be proven that we are inside a simulation then that could be only possible if that experiment would have an error somewhere or if it would be a constructed lie (again with an error somewhere hidden) to mislead people.