If you want to get non-techy users, then there is absolutely no need to even use the word fediverse or to try to explain what any of this means. If you want to help a friend get onboard, just send them a link to sign up on the same server that you use, or a nice general purpose server. That's it. They sign up, they use it, and THEN they can start to learn about fediverse shit if they care to.
Yes. You can use it without understanding how it works behind the scenes. At some point, they'll run into a situation where it is helpful to learn some part of how the fediverse works and then they can ask about it, generating more content and interaction along the way