I don’t think we should put too much creed into the “painting with light” moniker. It’s a catchy term, not an immutable law. You can be a photographer who paints in software or chemistry in addition to light, just like you can be, say, a renaissance man without literally emerging from a womb a second time.
Painting with oils or pastels is just as much “painting with light” as photography. The materials are chosen because of their ability to absorb and reflect portions of the visible spectrum. Similarly, chemistry, software, dyes, pigments, and any number of other “non light” ingredients play a role in photography that is every bit as essential as photons.