Which sort of emphasizes the insanity you ascribe to Mills! The photon is electromagnetic, "mass is electromagnetic in origin" so where is the mass of a photon?
You are thinking about the outdated concept of
electromagnetic mass. J. J. Thomson in 1881 saw that a charged sphere in an aether would act as if it had mass. By 1887, an aether had been ruled out by the
Michelson–Morley experiment. Special relativity shows that the mass equivalence of a body is related to its
total energy. An electromagnetic origin of mass was then abandoned with some later work on the theory itself.