So specifically, how am I wrong?
First evolution theory isn't about origins, it's about natural selection evolving new species from existing ones. to do this, natural selection picks from variations in the output or "phenotype' of EXISTING genes. In this case, the die is used to randomely select a phenotype of a wing, long, short, thick, wide etc. It is then tested to see how well it flies. This is the step that mimics design. The best available wing design is selected by random process, but they are "best" because they take advantage of the laws of physics which are not random, but very ordered. Nature itself produces something that looks like design, by eliminating the bad designs. This, by the way, is how Edison invented the light bulb. Trial and eror.