And when someone says that the original author of Erlang is speaking wrong about a basic mechanism of... Erlang, I don't think there's going to be many objective responses, probably more pointing and laughing.
I'm not well versed in either language, but from the examples provided in the TFA it looks to me like the capability/mechanism of the operator appears to exist in Erlang and Prolog, while the operator syntax itself is only in Elixir.