Yes studying api trivia doesn't have much use. These stuff doesn't need to be memorized. Ideally you memorize stuff that important to you and likely useful for you.
Let's use your example of memorizing dictionary in some foreign language x. This person will be able to read faster and more efficiently without having to stuck on some unknown word and looking up dictionary every 2 minutes. At this state this person is just simply reading and focusing the brain on the content itself.
Likewise with memorizing programming stuff, the person can now just simply code and freeing the brain to just focus on the problem. Consequently more time to code moderate amount and ensure familiarity with the craft. I think this so called the 10x engineer that the author mentioned.
Let's use your example of memorizing dictionary in some foreign language x. This person will be able to read faster and more efficiently without having to stuck on some unknown word and looking up dictionary every 2 minutes. At this state this person is just simply reading and focusing the brain on the content itself.
Likewise with memorizing programming stuff, the person can now just simply code and freeing the brain to just focus on the problem. Consequently more time to code moderate amount and ensure familiarity with the craft. I think this so called the 10x engineer that the author mentioned.