Matt is generalizing outside of the CNCF though. He specifically mentions Linux.
Personally, I wouldn't have used the term "all" absent having actually looked at the numbers myself. That said, it's probably at least mostly true, especially if you look at the subproject level in the case of projects like Linux and OpenStack.
> TL; DR: The vast of code contributions to each CNCF projects outside of Kubernetes come from a small subset of users and companies.
InfoWorld sensationalized the title.