That doesn’t mean that C and C++ aren’t also large, even larger, but this has been changing for years and only shows signs of accelerating, not slowing down.
This is the umpteenth time large tech companies have sponsored C++'s successor. Go was famously created to eventually supplant C++ at Google (or more specifically, solve the issue of long build times). Over a decade later, C++ is very much still in heavy usage at Google.
If I were a bettin' man (or if I were trying to increase my general employment odds), and the choices were between Rust or C++, I would pick C++.
That being said, if I were in a comfortable financial position, wanted to scratch a nerd itch, and have fun programming again, I would absolutely pick Rust over C++.
But those are two very different scenarios.
I agree with you that this is not the first time languages have tried to encroach on the last bastions of the spaces where C and C++ have not yet been ousted as the default choice, but Rust is actually gaining traction in production use-cases in those spaces, unlike many of those languages.