But he creates all this land, and eventually new consciousnesses are uploaded to the same realm and one of the guys was a geologist. He realizes everything isn't real because something like "it's impossible for this type of a mountain to be next to this type of river".
This is the ultimate tangent but yes, I had noticed that. In fact, I was also listening to an interview with Reid Hoffman the other day where I noticed the same thing — he must use the work "firmament" 1000x more than the typical person. And I know he has also talked about how Neal Stephenson's Snow Crash changed his life. Perhaps the influence is so deep that it's changed Hoffman's vocabulary.