It's an evaluation board for a technology stack. That's its "use". We wanted to explore the design space towards smaller/low power/cheaper and find out where we can still squeeze a fully functional Erlang VM. We are working on distributed computing that benefits when we can run the same BEAM files (Erlang VM object files) everywhere from IoT to Edge to Cloud
I love the idea of elixir/erlang in robotics/embedded environments, and so from my research I can confidently say very few. As far as I can tell, when people do use it it's primarily for industrial equipment, and the main selling point is liveview/scenic for displaying information about the equipment.
I want to believe we'd someday see erlang/elixir all over the place, especially in flight software, due to their use of "lightweight processes" and high fault tolerance, but I don't see it happening any time soon, and I certainly don't see people hiring for it. I think it could solve some legitimate industry issues but it's too big of a change for too subtle of benefits