I'm surprised that the author combines "the C languages" saying that most adverts that mention any of C/C++/C# mention all three. In my experience there is a large difference between companies searching for C# developers and those searching for C/C++. After blurring this distinction he concludes that R and Python are "very different languages" while I consider them to be largely overlapping.
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Agreed.
So far in my search, C# leans toward Microsoft shops seeking C#/.NET whereas C/C++ has been companies searching for embedded software roles.
Mostly agree, but I've also seen a fair bit of C/C++ skills associated with jobs involving *nix development environments. I've rarely seen C++ associated with embedded jobs (even though I've read that it can certainly be used if care is taken to avoid things like dynamic dispatch, etc)
C++ is very big in finance and game development.
C++ is used in avionics.
R and Python have some similarities, but saying a they are largely overlapping is a bit of an exaggeration.