In reading the article, it did feel somewhat wrong in a way that I couldn't quite describe. But after reading this comment, maybe it just seems old and maybe obsolete.

Taking the example provided in the article, I don't feel like the new code is meaningfully less complex. In fact, since it added some additional indirection, I could argue it's slightly more complex.

The core code with the nested if statements is something that I would probably refactor in some other way entirely. Maybe by taking advantage of other language features. It is a toy example so it's hard to say but that's part that feels like it needs simplification and untouched in this example.