Yeah there's definitely some overlap. Lots of dark UX is used for enshittification but sometimes enshittification is just plainly bold bad UX for the sake of making money with a hint of "Yeah it's bad. What are you going to do about it?"
On the other hand, enshittification is part of a cycle that starts with a service that grows dominant at least in part by providing a great experience, only to tear that experience down when it gets in the way of making money. Dark UX isn't always part of that cycle. Plenty of services of all sizes use these patterns right from the start. Not really accurate to call it "enshittification" when it was always just shit.
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Check your reading comprehension. That's not even close to the point of the article.
The article literally says that the author is fine being served ads on a free product.
The article is actually about so-called dark patterns in UX. The X button in Feedly is only used as an example to explain how a dark pattern subverts user expectation and how you can tell when you are writing code to do so.
Even if you thought you could "read between the lines" and claim that the author has ulterior motives, you would surely notice that the author is a developer and would absolutely know how to block ads.
I don't see how you can come away from that article thinking it's about ads.