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Author here, the article is more about how Rust and its ecosystem are nice tools for language designers rather than the beauty of Lisp.
The crates listed in that article are the ones I use for my compiler: https://letlang.dev
Lisp was only chosen as a way to demonstrate the power of those crates and Rust features. A kind of way of justifying my choices for Letlang.
It's not "you should do it like this" but "you can do it like this".
Well, the article is called "a simple Lisp", not "a fully featured Lisp". It's a demo, not a compliant implementation.
You may be interested by https://github.com/brundonsmith/rust_lisp though