I agree with C++ being a sledgehammer/chainsaw for web development.
However, I was looking at emweb.de, the website of the creators of this toolkit and they seem to be oriented towards web app development for embedded devices.
It does make sense to use C++ embedded devices because:
* You control the environment completely
* CPU cycles are not cheap
* "embedded" developers are already comfortable with C/C++
* One less "framework" to ship-out/maintain.
edit: formatting