Just so you know, because the images were uploaded with the Comfy metadata, the prompt is actually discoverable. You just have to click on "Comfy: 7 nodes" to copy the full nodes config and then you paste it in notepad or something and you can find the prompt among all the node info.

Of course, it's much easier when the uploader is not lazy and fill the prompt textbox himself.

I really don't understand why CivitAI does not have a better way to automatically prefill that textbox from the metadata at this point, this would save so much time.

I can recommend this node to help ensure you save lots of proper metadata: https://github.com/farizrifqi/ComfyUI-Image-Saver

It works well with CivitAI and auto-populates everything. you still have to set it up yourself, not too hard though.