You apparently don’t understand what randomness means. ‘A bias in the probability’ of something is pretty much exactly what we mean by non-random. Throwing dice is proverbially a random process. If you throw a die a thousand times, you expect to get a series of random numbers. If a particular die was biased towards, say, even numbers, it would deliver a non-random series of numbers. If natural selection is a bias in the probability of reproduction with respect to phenotype, that is equivalent to saying it is non-random. Do you really seriously not understand that?