No, that does not enlighten. I've written OSs, kernels, embedded systems - in C++. Because its a better language for those applications. The arguments in that link are spurious - just sound bytes to make the author feel better.

In no case does C++ require any more runtime than C. You can use little or no runtime at all in either language, with minimal effort.

Easier to write low-level in C? This is unsupportable. C++ can write anything you can write in C (its a superset), so anything possible in C is possible in C++, but now you have more leverage.