Funny, but no. You seem to have a limited view in what prompt engineering is and the history of prompting. Prompting in software engineering is more than just using LLMs. Before LLMs, there were static choices with limited variations of inputs like the old chat based applications, auto response options on phone menus, and other such applications. Today, in addition to the ChatGPT like applications reliant on LLMs, there are other ways of prompting a human for an input to use in an application. One such example is with physical gestures in virtual reality.
Here's the relevant section from what I can gather from parent's response:
These are especially applicable in human-computer interaction interfaces where physical movements act as prompts.