The author is using the word “proprioception” differently from its established meaning. It’s not just a general idea of where you are in the world. That include

The author is using the word “proprioception” differently from its established meaning. It’s not just a general idea of where you are in the world. That includes so many other senses. It’s specifically the sense of the body’s position in relation to itself. Is your arm straight or bent? This is a proprioception question. Having the feeling of being in a shack is not proprioception. https://en.m.wikipedia.org/wiki/Proprioception https://en.m.wikipedia.org/wiki/Proprioception