The shouldn't come as any surprise. Computer simulations are routinely used for training and conditioning in a variety of situations from flight training to military applications.

Perhaps the base is camouflaged? They've been doing that sort of thing for a very long time. I remember seeing some pictures of an old base that was covered to look like a small neighborhood. That makes more sense to me than some Google censorship conspiracy. Besides, censoring Google Maps in this way hardly makes sense since because anyone wanting to see a detailed picture of the base could get it from some other source that could not be persuaded to censor it. It's much safer to disguise the base itself. I imagine there are many satellites controlled by quite a few countries that are capable of taking pictures at least as detailed as this.