If you - like me - buy into the idea that the real "inventor" of something is the person who explained it so well that it never needed to be invented again, then you can make a pretty compelling argument that there are entire fields of computation, tools and algorithms that are widely used right now, that still haven't been invented yet.
@mhoye I might miss something here, but...
I think the premise is wrong. The inventor is not the one who explains something really good; it's the one who first invented it.
It's a bit like that "if a tree falls in the woods, and there's no one listening, does it make a sound?" Yes, it does. Listening is not required for sound to exist. Other people understanding an invention is not required for an inventor to have something invented.
(But it's probably a some figure of speech, I guess?)