This is pretty hacky and it smells. it also won't work in languages like typescript (without losing the advantage of using it) which is frequently used.
I do absolutely not see the author advocating returning values in an array instead of an object, in fact, they seems to be saying the exact opposite? (starting with the array example, and then going to the object example afterwards)
The primary point of the article is the destructuring which makes the syntax much nicer.
It will work just fine in TypeScript, where you can define a "fixed size" array as a type:
type Test = [number, string];
const test: Test = [1, 'something'];