Does that RedMonk chart not show that it is fairly cool? You have C# and Java at the top - I wouldn't call them cool, widespread, not cool. It's above, on both axes Arduino, Dart, TypeScript. It's in the vicinity of Clojure, Go, CoffeeScript.
It's also worth considering that these questions were asked of Erlang users, so it's the communities opinion of itself. I as an outsider would say my biggest issue with Erlang is that it's a highly event driven system and I don't like event based systems. Events are basically a more opaque form of GOTO and thus suffer the same criticisms. Events are sometimes the simplest way to model something, but as a general paradigm to solve all problems they really suck and do terrible things to your program architecture.
Does anyone know why they would include a hardware device among a ranking of programming languages? The most prominent language used to program Arduinos is probably C, followed by C++ and then AVR assembly.
I don't understand why they would include it among programming languages.
So again, you can't run Java or Processing on the Arduino. Keep researching.