Yes, but a textbook has fixed knowledge that cannot be queried and discussed. That's why you need the doctor to interpret and apply.

An LLM is the doctor in your pocket. It's yours to use, and whether it is in your head (like a doctor who had to take exams to prove they really had it in their head), or in your pocket makes no difference in your ability to achieve a task.

"Intelligence: the ability to acquire and apply knowledge and skills."

Well, if I can acquire knowledge from the LLM, and apply it using the LLM's instructions, I now have achieved intelligence without doing an exam.

Problem is, I can lose my LLM. A doctor could lose their mental faculties though.