Ah sorry, I've already forgotten about these settings since last year when I modified the game the last time. Now I also know why I got confused with that: Even if it takes 6 workers by default at beginning, there is a hidden substraction of 1 from this minimum of 6 afterwards. E.g. if you set the minimum to 5, you only need 5, 9, 14, 19, 24,.. labs or 5, 14, 24, 34, 44,... workshops. The guide above isn’t explaining that correctly. Still too bad you can't set scientist or engineer requirements for other facilities besides radars.