Why would a business want to prioritize the experience of its developers over its users?
See usage of React Native for example, it certainly produces apps worse than native ones, however many businesses still choose to work with it because you can improve the developer experience and ship faster.
Of course there are exceptions. But it's definitely a hot take to say you should never prioritize DX over UX.
If your business competitors prioritise UX over DX, your users will soon know. And then they won't be your users any more.
All those are important, and given a talented team, there is absolutely no reason why you cannot have good UX, lots of features, few bugs shipped on time.
Maybe you are mixing up the UI design with the UX? In any case, the original point is just highlighting the importance of UX, without giving any solid examples of DX.
I've worked in quite a few companies that were always pushing to ship faster and we're okay with the trade offs in missing tests and worse UX. The talk was always that we'd ship fast now so we can step back and clean up later but that's extremely rare in my experience.