It’s a bit more than Arch. There are a bunch of programs written in shell and QML/JavaScript. I guess at least they are using memory-safe languages, but shell scripts make it easier to write the type of shell-injection bug mentioned in the article. Personally if I started a new project in 2026, I would not choose bash and vanilla JavaScript as the languages to write it in.
The repo for reference:
https://github.com/basecamp/omarchy