For it to be "hard science", you'd have to be able to provide me with the actual theoretical if not actual physics that describe exactly how it functions.
If you can't, it
isn't hard sci-fi. If your explanation is "it could be something we just don't know yet", you're outside hard science fiction.
I encourage you to go way back to my first posts in this thread where I said I like both Star Trek and Star Wars.
These weren't condemnations; it's just an establishment of subgenre standards. I was making the point that both Trek and Wars are soft science fiction that engage in a lot of pseudo-science magical nonsense. Not that doing so was somehow "bad", in
either case.
It isn't just Vulcans.
Betazoid telepathy.
The Q.
The Bajoran Prophets.
Plenty of other cases.
Star Trek has as much of this kind of hand-wavey stuff as Star Wars. By the arguments you're using, The Force is "science", too, for that matter.
No, it is not. Star Wars is clearly science fiction. Spaceships and all that.
Dude, take some time to learn some subgenre classifications.
https://en.wikipedia.org/wiki/Hard_science_fiction