They aren’t just intelligence mimics, they are people mimics, and they’re getting better at it with every generation.
Whether they are intelligent or not, whether they are people or not, it ultimately does not matter when it comes to what they can actually do, what they can actually automate. If they mimic a particular scenario or human task well enough that the job gets done, they can replace intelligence even if they are “not intelligent”.
If by now someone still isn’t convinced that LLMs can indeed automate some of those intelligence tasks, then I would argue they are not open to being convinced.