That's the point at which most sane people would tell the interviewer to "GTFO".
If they're hiring for some hyper unique role where they have to deal with some contrived AI in a dark room and they have to do it because someone's got a gun to their heads and they have to invent calculus to solve FizzBuzz in under 14.5 minutes otherwise the memory is corrupted and the world explodes, then sure they can ask such a contrived interview question.
Until then, this company is either crazy, bored, not looking to hire a candidate, or simply fictional and made up by the author to tell a feel-good story that makes them look like the Einstein-equivalent for programmers.
If they're hiring for some hyper unique role where they have to deal with some contrived AI in a dark room and they have to do it because someone's got a gun to their heads and they have to invent calculus to solve FizzBuzz in under 14.5 minutes otherwise the memory is corrupted and the world explodes, then sure they can ask such a contrived interview question.
Until then, this company is either crazy, bored, not looking to hire a candidate, or simply fictional and made up by the author to tell a feel-good story that makes them look like the Einstein-equivalent for programmers.