The topic creator's argument held water with me until it hit point 5. 'World hierarchy' is an abstract human concept that doesn't really mean anything.
Humans are made of atoms, which are organised into molecules, which are organised into cells, which are organised into humans. In your example of a simulated computer world, that simulated human would be made of atoms, which would be organised into molucules, which would be organised into transistors, which would be organised into cells, which would be organised into humans. At the end of the day, we're both just patterns made out of atoms. There is no different 'hierarchy'.
If our simulated human looked down far enough, he'd still find that he was made out of atoms, the same as us. He would also theoretically be capable of creating devices that could allow him to see beyond the contraints of his computer at the 'real' world (a webcam springs to mind...). He exists just as fully in the 'real' world as we do, not on another plane of reality.
There also appears to be the assumption that if we are in a virtual reality that god created, and we are a pattern that could theoretically be copied to a 'higher hierarchy' of existance, that this god would do so.
Our virtual man is a pattern. This pattern could be copied to our 'real' world upon death, theoretically. That doesn't mean we have to do so, or would! When he dies the memory allocated to him might just be wiped, and his pattern is lost.
The idea of reality being a big game of dwarf fortress isn't exactly comforting to me. For a start, I know when my dwarves die they aren't resurrected in this world. There's no afterlife for those virtual men (...dwarves), even if it is theoretically possible (we COULD build robots that contain our dwarve's personalities when they die ingame... but we don't).
Also, I just watched my dwarves burn in magma because I was bored and thought it'd be funny. I imagine most of us do that from time to time. If there's a god, so does he apparently.