> So while GPT-3 is truly remarkable in its ability to generate text, it cannot, by definition, communicate
GPT-3 does nothing without a human inputting what it wants it to output. GPT-3 is as much a tool for communication as are sounds, words, symbols, etc.
Whether it was carved in stone by a human hand or generated on the cloud by an AI, the intent to communicate is always coming from a human.
If you think the text generated by GPT-3 does not carry the right meaning or has "no underlying _thing_ that is being communicated", it just means that the human behind is not using the tool properly. Just like sometimes you use a word that doesn't mean what you think it means.