Earlier quoted context omitted.
The point is all of that is optional. You can - and I have - write C to be executed on bare hardware with no initialisation code, and depending on your choice of libc you can still use it (though some functionality may not be available).
At which point it is no longer C, rather a programing language that vaguely resembles ISO C.
Nothing stops you from e.g. providing your own startup code which then calls the appropriate initialisation code either.
The point being that there's no enforced inversion of control in the sense used by the article, and so calling it a framework in the sense described by the article is meaningless.
Even if we postulated the inversion of control was there, the fact you can replace all parts of it still means it does not fit the article definition.