I haven't watched the videos yet but your post makes a lot of sense to me. I like this sort of thing.
Well, the theory is pretty old if I recall.
It get's very interesting if you then consider if the creator of the simulation wanted to find out about religion - as in a simulation the actual events depicted in religious scripts could have happened lol.
A bit ironic that the only way I'd consider religion as a genuine possibility would be if our entire universe was fictional.
But as somebody else here mentioned, the actual reality could have a completely different law of physics for all we know, our reality could be nothing more than a complex version of Civilisation MM

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But until evidence can be provided (very difficult this one) - it's just an interesting theory, but as our technology progresses it may gain more momentum (closer to the level required to run this kind of simulation, or when we are able to create the first AI with human level self awareness).
As once you can create an AI which is self aware, you can dictate it's surroundings (as it's not a physical object) - from this you can see how it may be possible to make the small steps required.
I don't believe it personally, as I don't think as a society we will make it to the technological level required (due to a conflicting theory of the Kardashev scale)
http://en.wikipedia.org/wiki/Kardashev_scale
The basic theory being, that before we obtain the technological level required to leave earth, we will have destroyed ourselves in war - which is put forward as a theory as to why we have not seen any aliens & why the universe isn't teeming with life in all corners.
Most (or potentially all) civilisations don't get past stage 1.