It might be a better wording to say "reducing chances of introducing vulnerabilities". The appeal of Rust is that it makes it easier to write safer code, not that it makes it impossible to write bad code. You can write code in C to be as safe as if written in Rust. And with the advent of coding agents who can check for vulnerabilities, Rust might lose its edge against C. Both will have a long and fruitful life, but nothing like a takeover will ever happen, the fundamentals of C are unparalleled.