Read the article. They’re using replaceable modules.

I actually just made that exact switch this year. It’s actually pretty fun to try out lots of folks’ shared setups without worry. (Ended up basing my system off this one https://github.com/Frost-Phoenix/nixos-config)

This was legitimately fascinating. It’s crazy that Bloomberg reported on the same issue and didn’t find anything. Their reporters are terrible at their jobs or were prevented from doing them properly. Either way Bloomberg looks inept or corrupt.