He was just confirming the way that the genetic algorithm for the wing design works.
Simulating the orbits of the planets is far, far simpler than simulating anything even remotely close to realistic evolution of an entire biosphere. We don't have the computing power to simulate gene transcription, protein synthesis, organelles, etc. for every one of millions, billions or trillions of individuals in a computer-simulated, evolving population. We have to simplify it significantly. In doing that, things that happen in the real world are obviously not going to be able to happen in the simulation.