This "word creation" ability is a novelty that was likely deliberately baked in after the initial round of criticism towards the inability of earlier versions to do exactly this. If it took the liberty of creating a term based on encountering an ineffable idea, sure, it would have created something. In your example, it isn't creating anything new so much as rearranging known word parts based on a prompt. Arguing that it's creating something new just because it created an arrangement that can't be found on Google is missing the point that its still just arranging tokens, and not actually attempting to communicate a new idea through denotation.