@toxi there is a belief among some LLM users that if you tell the LLM it is an expert, it will behave like one. There is some evidence to support this belief, which is both funny and annoying, but it leads to some weird superstitions about how much impact it can have and how many times you have to repeat yourself to get it to believe it is an expert.
So, the optimistic read of this is not that it's about deceiving the viewer, but rather deceiving the model into behaving more like an expert.