If that were the case it would make the situation even worse. It means the whole "write performance critical parts in C" argument is bogus.

To answer your original question - no, but there's less C code than the equivalent C-only program, so you're still better off. Or if your argument is that C is a security nightmare (which you won't find much argument from me on), replace C/CPython with Java/Jython.

You could write performance critical parts in a safer language, though, such as Rust (disclaimer: I work on Rust). C isn't the only option here.