HI Mike!
So here are some Divi Child theme creators that can work with WordPress Multisite.
https://divicake.com/divi-child-theme-generator/
or the plugins here https://wordpress.org/plugins/orbisius-child-theme-creator/
These are easier way to create Child themes.
As Far as the code, I would think you dont need the exact code since Divi is upgraded now.
Hope that helps.
Regards
