You’ve misunderstood me. None of those things are what that commenter is referring to. It’s not about improving another energy storage technology by using superconductors, it’s about having a room temperature, ambient pressure version of an existing technology that we already use superconductors for.
I think what they’re referring to is the idea that superconductors can trap current effectively indefinitely; more like replacing a battery with a capacitor than enhancing existing battery chemistry.
This one I can really get behind