It’s like one computer with program (DNA) and helper programs (RNA) creates second generation of computer and programs (proteins, lipids, carbohydrates) that essentially create their own version of computer system in which they govern things like enzymes, hormones etc

But keep in mind that humans are not created in vacuum. After those two levels of computer create third level that is brain, actual programming of brain is done by other living humans.

So actual „humanity” is what persists in living population and would reset when population is culled and newborn must live and learn on their own.

Even if such newborn would live long enough to have access to things like books, computers, even sound and video records… those would be completely useless to them because they won’t even know language and skills required to use those.