Nonsense...Superman absorbs the inertial energy disruptions onto himself and no one dies....
Well it’s just as good an explanation as the stuff Engineer Scott and Spock come up with on Star Trek to save the universe’s women from all being kissed by Captain Kirk...all at once!
I actually came up with a good scientific explanation for how Superman can fly. He physically does it. He physically moves the atoms of his muscles to provide motion towards whatever direction he wants to go. That changes the mass of his body to provide lift, direction, and speed. I haven’t seen this idea anywhere online.
You know how sometimes you have dreams when you fly?
This is exactly how I fly in my dreams.