Why? The talk is about F#.
Also, sooner or later people will notice difficulties in communicating exceptional events up and down the chain and they would be greatly served by how Erlang/Elixir handles errors and process trees. Even if you want to stay in c# or f#, there's still wisdom to be gained by looking at how things work in functional languages and applying what you can in non functional languages.
It's not strange that he doesn't mention SML, Caml, OCaml, Miranda, Haskell etc given this context.