If they said that their dream is to solve physics, I'd say "that's cool and I can't wait to see how it turns out." LLMs have gotten so good at mathematics, and are so adroit at analyzing vast quantities of data, that they might have a really good shot.

But they said that they want to cure cancer. That's far outside the core competencies of any LLM, and it requires a lot of real-world wetwork with liquids, chemicals, cell line experiments, animal experiments, etc. They can't merely analyze existing data -- they'd need to generate vast amounts of new data, which isn't really the case in physics. And then regulatory approvals and so forth.

"We're working on curing cancer" sounds more like a poor PR attempt than an actual effort, though I'd love to be wrong.