I took it more as the bulk of the article explaining the differences and problems in algorithms. Just knowing that you can use a non-backtracking regex engine is fine, of course. Knowing how folks got it wrong is pedagogical in its own right.

As an easy additional point to the lesson, it might not be clear to everyone why you have to take care on which regex engine you move to.

No, the Go standard library implementation is mentioned in a single paragraph. The Go code in the article is written simply as an illustration.