No you are right. You can't invoke gravity in an analogy trying to explain gravity.
The same effect could be replicated in a zero-gravity environment using an alternative background force (centrifugal force, vacuum suction, electromagnetism, etc.)
Not without a bridge for the metaphor to generalize. What parameters map to the nutjar’s selective force, size, and mass?
The same effect could be replicated in a zero-gravity environment using an alternative background force (centrifugal force, vacuum suction, electromagnetism, etc.)