> Lisp is the most expressive and flexible language. You can reach a flow-state where ideas can freely flow from your mind into code

This kind of claim typically comes from someone pretty new to the world of software development.

You can say this of any language, really, and any developer who's reasonably proficient in language X will also claim that with X, their ideas flow directly into code.

> The Lisp programming language Racket is used to teach programming fundamentals in modern Computer Science courses.

Unsurprising cherry picking. How many universities teach Racket compared to, Javascript C/C++, or Java?

The rest of the article is of the same cloth, raving about Lisp and Clojure as the best programming languages ever invented.

You should learn Lisp, no matter what kind of developer you are. But by today's standards, Lisp a pretty antiquated language which still hasn't caught up to modern trends (static types, asynchronism, etc...) and with a very poor tooling (lack of IDE's) and library ecosystem (building websites, parallelism, GUI, etc...).

Literally all of these things are present in Common Lisp (ok the static types "full experience" leads you to something like Coalton: https://github.com/coalton-lang/coalton however the plain SBCL experience does have some compile-time type checking). Meanwhile many so-called modern languages still lack Lisp's incremental compilation let alone the full interactive development experience such a feature can help support, an OOP system as flexible as CLOS, they can't gracefully manipulate their own code as data, they don't have anything like the condition system...