That is the understanding of science, my question goes to the possibility as to whether fitness is in fact determined by the non-random mutation itself.
Thereby questioning when in fact fitness is determined.
You seem to be suggesting that the cause of (a) mutation(s) is directed by some agency in order to compensate for a future event that would change the organisms fitness?
Are you are suggesting that the mutation that allowed a strain of bacteria to be able to digest nylon was directed by some agency that had the foreknowledge of the discovery of nylon?