I think there might be a miscommunication going on here.
I see Stuart arguing that Genetic algorithms function independent of physics in terms of their consistent "friendly" trait. i.e. if in universe a there is a genetic algorithm that finds value in expressing the "friendly" trait, then that algorithm would, if placed in universe b (where the boundary conditions of the universe were slightly different) would tend to eventually express that "friendly" trait again. Thereby meaning robust (when compared to systems that could not...
Oh, now I feel silly. The horse IS the other universe.