No it doesn't. There is actually no logical way to infer from the parent statement that language choice doesn't matter for security.
> But in practice they work well enough to push C's foibles down into the noise floor.
This goes against findings from research that has been done into the sources of security vulnerabilities. Microsoft and the chrome dev teams have published that 70% of their security bugs are a result of memory safety.
If C is used in 100 years it will only be because of inertia. Today there are better choices in the domain of low level systems programming languages.