Yes, that's an incredibly bold statement. Javascript today is probably the most popular language in the world (according to Github; other indices tell a different story), and that gives it the very same role that at once was fulfilled by Java or even PHP: it's probably the first language a newcomer will learn programming with, hence you'll find a lot of unskilled engineers as well as some experts.

So, saying that Javascript devs, just because they're interested in Elm, are "the cream of the crop"... sounds ludicrous.