Interesting. I've skimmed the article and I can easily believe that some people can consciously observe their model of the world from a physical position different from a position of their body.
From a perspective of ML/computer vision, think this way: You take bunch of photos and then build a 3d model. After that, you can construct the image taken from any location within the observed area. And if the model is good enough, you can construct realistic images even outside the visible region.
It would have to be to operate in this 'infinite' physical environment. A place where we can only theorise about the concept of 'beginning' or 'end' or 'smallest' or 'largest'. We are literally living in an experience we don't have the mental ability to delineate.
From a perspective of ML/computer vision, think this way: You take bunch of photos and then build a 3d model. After that, you can construct the image taken from any location within the observed area. And if the model is good enough, you can construct realistic images even outside the visible region.