The unescapable, implied premise is that animals share information, and even do so historically, e.g. “35 generations ago your great uncle Bob tried to eat a black, yellow, and red banded snake and it killed him. So stay away from those things.”
Since the coral snake is so very reclusive, I wonder if there is any documentation at all that predators avoid eating them. Frankly, it smells to me like another evolution pipe dream, where a biologist sees an oddity (like two very similar snakes) and instantly ascribes evolutionary meaning to it.
Scientists consistently state that life evolves to fit a purpose, but they have never identified anything that would guide that evolution to an end result. Although random mutation could explain the filling of empty and more promising niche habitats, it is also logically true that evolution isn't so much survival of the fittest, but rather survival of the fit enough, e.g. maybe giraffes just got taller because they have a genetic abnormality and they managed to deal with it well enough to survive.