Every company that has the ability to do this as a recruiting tool will do it. We're using Elixir / we're using OCaml / we're using Clojure (we're using NLP / we're using ML). In every case there will be some "business" guy who understands just enough to try to impress some potential recruit. If you don't understand the domain and their actual usage of the tool or language enough to fall for this and not ask further questions, it's kind of a problem on your part.