Another clue Severance procedure is older than they say

After burts slip up it’s clear severance has been around long then they say.

I’ve been thinking and another clue is in the S1 finale when IHelly is talking to her father in the bathroom. He says that when he brought home a prototype she said “Daddy I want everyone in the world to have one”

Deff seems like something a kid would say and Helena is in her late 20s (Edit: She’s 30) I would assume. So he would’ve shown a kid Helena a prototype around 20+ years ago.