I don't have to show any "necessity" for code. I need merely take the reasonable position that the human brain is programmed to receive and process information, which if there were no information, there would be no intelligent design. I think science is better off looking for "code" in rocks than it is looking for whatever the opposite of "code" might be.
Processing observations does not require a "code." The observations processed are not "codes." Photons hitting a photoreceptor and being turned into electrical energy are not imparting any "code" to that receptor. Photons hitting a photoreceptor in the eye and being turned into electro-chemical cascades are not utilizing any "code."