Yes, this is like something I would do for a DnD bit. But I have this experience often, that LLMs will suggest the easy toy version of doing something. But it knows the real stuff too, it just needs the right kind of prompting. A keyword or two, and it will find the _real_ solution.

Agreed, this is the kind of steganography that is meant for humans to read. There's no reason a computer couldn't encode meaningful information in the least significant bytes of every 16th pixel or something like that.