"There is no serious evidence for the simulation theory." Well, there are weird effects that would make sense in a simulated world (like superposition until observed). But the argument is a statistical one.

Can a world be simulated in a computer?

If yes, how many worlds and individuals are simulated at the same time? (And it may make sense for example market research, science etc. Of cause the simulation will run much faster then the real world).

Then there is a problem. If the world CAN be simulated and MUCH MORE simulated individuals exists than real persons it is more likely for you to live in a simulation than in the real world. A point worth thinking about.