You say this, yet people such as Helen Keller suggest that a full sensorium is not necessary to be a full human. She had some grasp of the idea of colour, of sound, and could use the words around them appropriately - yet had no firsthand experience of either. Is it really so different?

I think “we” each comprise a number of models, language being just one of them - however an extremely powerful one, as it allows the transmission of thought across time and space. It’s therefore understandable that much of what we recognise as conscious thought, of a model of the world, emerges from such an information dense system. It’s literally developed to describe the world, efficiently and completely, and so that symbol map an LLM carries possibly isn’t that different to our own.