I didn't watch the video, but maybe they said how this done.

If it installed silently, it must be getting pulled in via Windows update right? Where Microsoft just sees this a regular old driver for a device I would imagine?

I have an LG monitor, maybe about 5 years or older. But I don't have windows so I assume it knows nothing.

EDIT: Nevermind. I went and watched the section at the beginning, and yep that is exactly how it is done. Does windows not even vet what a vendor hands them as a driver? Perhaps they don't care, but this seems like an easily exploitable route.