For small stuff, sure. For something with more components I don't think it's ever gonna be useful. Routing a pcb is an np-hard problem and, imho, no AI has enough actual thinking capability to make a good job out of it.
There's no reason to think a conventional LLM is the right approach, of course. But the LLM could delegate the task to a program it wrote, given the right prompting and the right feedback loop(s).