input(“ask me any question”)
    print(“I don’t know”)

behold, Plato’s PhD level expert on any topic.

It’s missing the line for “if I don’t know the answer”

It always doesn't know the answer, there's no branching possible, so no need for a branch test. By your definition that makes it a "true subject matter expert" on every subject. Although if you squint a bit, it does look rather like a plucked chicken.

https://commons.wikimedia.org/wiki/File:Anonymous_-_Diogenes...

Yes, but that better not be all the time, and around basic questions.

Sounds more like the sign of just a humble, honest person