I(x:y) is the algorithmic mutual information between x and y.
If X is some early simple biological organism and Y is a later complex biological organism, and evolution (E) is some combination of algorithmic processing and randomness injection, then I(X:Y) \geq I(E(X):Y). So, this says evolution doesn’t provide any help in turning X into Y. If X turns into Y, it is only because Y is the natural outcome of X, and evolution has nothing to do with it. In fact, the only thing evolution can do is prevent X from turning into Y.