Absolutely. However, the extent of C++ usage (and more generally "system languages") has indisputably shrunk over a wide range of domains. Startups are a great example.
I know C++ very well, but I also know Ruby well.
Some startups *ARE* using them, just not web/app startups. C is still heavily used in algorithmic, infrastructure, and networking startups - But they're a different crowd. More neckbeard and device drivers than TechCrucnh and Rails.
But I do agree that it's use cases have been marginalized more.
Oh look, you found ONE. Good fucking job. If you look hard enough, you could find one ANYTHING. It appears you really missed the point devbug was trying to make.
My point was, that start-ups differ. As well as technologies they focus on. Not all start-ups are about the Web and frontend tech. Many are about backend, others are about core technologies like mobile operating systems and so on. Numbers are not the point. But significance and impact are.