Seeing that you're so cocksure, you wouldn't have any problems substantiating your claims, right?
C++ has made huge progress in writing safer, more reliable code with the C++11 standard, and these topics are an important focus point for the coming standards.
I'm not cocksure. That's why I hedged with "seems to me", i.e. this is my opinion.
However, to substantiate my claim, at least for C, I only have to point back to the original article.
It's possible that things have improved with C++11, I don't know. However, I would think that if C++11 were suitable for writing secure code, that DJB would be aware of this and just say so instead of advocating for a new C compiler.
C++ has made huge progress in writing safer, more reliable code with the C++11 standard, and these topics are an important focus point for the coming standards.