Almost everyone would agree that listing 'git' as a skill implies knowing the operation of using git, not the specifics of how it works under the hood...
I don't think there's anything 'gotcha' about the question. If you understand that git uses SHA1 for the objects it stores, the answer is pretty obvious. If you don't, you really don't know git.
I would say that listing anything as a skill implies knowing of how it works under the hood, until stated otherwise. It’s a resume, not a list of random TIL facts.
Why ask such a gotcha question?