John Carmack? He's got one answer on stack overflow, limited open source contributions, a few conference talks, no books, no papers. He's known for producing actual results and not for any of the things you ascribe as 10x required.
Sure, if literally porting the entire X Windows System[1] to OSX is "limited." Or basically paving the way for Linux gaming/3D development because of his work on OpenGL. Let alone his entrepreneurial/seed efforts w.r.t. Oculus, etc. Also, he spoke at Facebook's 2021 Keynote. C'mon, man.
You pick on the one thing that dilutes your point. Carmack is known and famous for developing software -- not for dicking around on Stack Overflow, etc. He was famous long before he ever gave a talk -- and initially he was terrible at talks -- but he was always a 10x developer.
I've worked with some amazing developers who've created unbelievable products that have never written a book, a paper, given a talk, or done a conference. They are probably the silent majority of 10x developers.
