Not a fan of the explanation. For example where does his superspeed come from? I'd rather they go off the wall with crazy comcis scifi like flash with his "speed force" or green lantern with the whole "emotional spectrum". At least their true to their creations. Are either of these things based in "hard science"? Heck no! But does it work in a comic and come across as interesting and fun, Heck yes, baby!!! It creates its own unique mythology for each character that can be expanded upon exponentially! I love the speed force and the emotional spectrum.
Pigeon holing superman into "realistic science" is counterproductive. it doesn't help the character. The average person just thinks his skin is tough and he's really strong etc. The aura thing is over doing it. His other powers aren't explained in detail why does his invulnerability need to be. In comics characters fall into a few categories, one is energy manipulation (green lantern), another is mental powers, another is "physical powerhouse" to me superman above all others falls into that category, along with thor and hulk. Using the aura explanation moves him into the "energy manipulation" category which is the polar opposite of superman imo. Give me crazy comics science over real science any day.