How do I execute remote events with module scripts?

I am desperately trying to understand FE in the slightest, and I was looking in the Line Runner Roblox starter place, and this guy (TheGamer101) had only two remote events, ExecuteBehaviour and RunStarting, and yet his game worked perfectly, so I was looking in explorer to try and find the cause and he has a bunch of module scripts inside the main script, and it loads in objects into the workspace, but I thought you can only load things into the workspace through local scripts. can someone please explain how I can load things into the workspace with a script in server script service?