Lots of outlandish fringe theories from shambolic rubes who haven't read The Lexington Letter
Seriously, you really need to read it. It's a short read and it provides some insight into the goings-on at Lumon, and also includes the MDR team manual.
https://ia600600.us.archive.org/22/items/severance_202407/iBooksExport%20Severance-cropped_text.pdf
Edit: if it's blurry, try this one https://www.scribd.com/document/578396113/Severance-The-Lexington-Letter