You ever think that the Fortress might not be a fortress?
It might accurately be the kryptonian equivalent of a "pup-tent"?
It's not some marvel Jor-El invented, it's something he picked up at the Krptonian equivalent of "Target" or some other chain store on the way home from work one evening, and Stamps voice was never supposed to be Jor-Els, it's just the default setting for the voice emulator and using the default setting for the emulator is about the same as leaving the digits "12:00" still blinking on the face of your VCR 15 years after purchase because you can't figure out how to program the damn clock.
They probably even used a celebrity for the voice template, you know like how an earthling raised by an AI on some distant world would probably think Morgan Freeman was their Pa. By Kryptonian celebrity, you of course realise that I mean (old) General Zod?
The real Jor-El might be no more talented an engineer than While E Coyote mail ordering doodads from ACME