The diagrams in this article are just outright wrong.
Models are not 1.prompt->2.forward propagation->3.response->4.end.
They are 1.prompt->2.forward propagation->3.partial response->if not done goto 2.-> end.
And if you can't see how that adds a world of complexity I'm not sure what else to say. AI may not have intent or motivation, but the ability to show that is currently well beyond our means.