The context is pretty different - Duplex was a public demo, this is a research paper with a whole paper behind it. There's no reason to script something if they have a working algorithm...
Looking more closely at the code it generates I'm not sure what the point of putting ChatGPT in that loop is? Rotating until an object is in view isn't a very useful strategy for finding an object, and a non-techical user wouldn't be able to resolve that easily, and a technical user who knew about those basic functions could code the finding strategy he wants based on those examples and instructions.
You would produce a better and easier to use interface faster and with less work by just exposing a few high level utility functions that are better designed than what ChatGPT generates there. Or at least it would be better to let ChatGPT use those high level functions.
If they could make it solve a maze or find something in a more complex environment they would have shown that.
