This statement is incorrect. There are important differences between arrow functions and regular function.
> An arrow function expression is a syntactically compact alternative to a regular function expression, although without its own bindings to the this, arguments, super, or new.target keywords
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...
You can refactor an arrow function into a specific regular function but you usually end up with something more verbose.
Or in other words you can express all things "arrow" before it existed. Which is exactly what we did before they were adopted. And we still in fact do, just automated by transpilers like Babel[0].
But more importantly, in the context of the article: all functions in JS are closures, regardless of how you write them.
[0] https://babeljs.io/docs/en/babel-plugin-transform-arrow-func...
Fair enough, but you are probably alone in doing so.