I think the question has accidentally shifted here. ChatGPT knows that hands have five fingers because it's trained on text and text will almost always say tha

I think the question has accidentally shifted here. ChatGPT knows that hands have five fingers because it's trained on text and text will almost always say that. DALL-E doesn't know that hands have five fingers, it just knows what hands generally look like, and the number of fingers on a hand is just one of the elements it tries to match. At a glance, there are far more important elements of what a hand looks like, such as the shading. Neither of these mean either AI is stupid. DALL-E doesn't have a concept of what a hand is, it just has an idea of what is looks like, and it's decent at recreating that.