There's enough ambiguity and lack of details that I don't feel comfortable with that assumption (though it's certainly not invalid either). Jor-El said that the time frame between the last natural birth was on the order of centuries, whereas the Scout Ship is from some 20K years prior. The Scout Ship has a bunch of birthing pods for artificial conception/maturation, but that could be chalked up more to the ship's nature as a colony ship, rather than some dogmatic imperative requiring cloning and rigid societal planning. The Scout Ship also hails from Krypton's Golden Age where learning, exploration, and advancement defined their society. And the present, a Dark Age where stagnancy, ignorance, and adherence to strict dogma rules. And the strict genetic purity/predeterminism seems at odds with how their Golden Age is characterized and how a society actually evolves and flourishes. Just by Occam's razor, it feels like the no-locked-doors approach is probably the most plausible. Computer does a simple determination that you're not some alien pirate raider, and a Kryptionian you're good to go.I just assumed that, since pre-Kal-El kids were genetically engineered into their specific niches in life, Zod's biometrics would automatically give him whatever authority/access level was required by the scout ship's more dangerous functions.