Talk about cherry-picking. It's pretty clear from those comments that they've worked with Erlang before, as well as Haskell and C++, and that they've transitioned to use Rust.

For example, in the same comment that begins with "As a long time Erlang developer", they later continue: "I’m more optimistic about Rust ... We’ve been able to scale Rust to handle the same load as our Erlang cluster". So there's no contradiction here.