Rather "he describes and quantifies" some form of 'superconductivity' of his own regard.
They are however currently mass produced specifically "because of quantum theory". I'm currently in such a production facility surrounded by banks of scanning tunneling electron microscopes and atomic force analyzers used in such production.
Guess who was Mills' inspiration for a classical physics approach to quantum phenomena ? Hermann Haus, his engineering professor. Yet look at the 'quantum' nature of Haus' research:
https://physicstoday.scitation.org/doi/pdf/10.1063/1.1712509
All theses types of things Mills can describe classically.