I think you’re misinterpreting the point of the article. It’s not gloating about how much they scale, or saying their particular tech beats other techs. It’s just explaining how to solve a specific scaling issue on a specific platform.

As an Elixir user who had to deal with high connections/s in the past, I found it interesting and useful. I use Elixir for reasons that have nothing to do with performance so a language comparison isn’t particularly interesting.