GPTx is not communicating with anyone. It is generating text that resembles text it had in its training set. The fact that human text is normally a form of communication doesn't make generating quasi-random text communication in itself. GPTx is no more communicating than a printer is when printing out text.
A cat or dog leading you to their empty food bowl is actual communication, and they are capable of much more advanced communication as well (especially dogs). The fact that it doesn't look like written text is not that relevant. They are of course worse than GPTx at producing text, just like they are worse than a printer at writing it on a blank page.
