The examples use CDI (dependency injection through annotations) and yes, these annotations become hardwired to the business objects... Java has some kind of traits now through interfaces so it's not much of a problem today.
Well that's the article's premise, right? Opening sentence:
Java is good by modern standards, from a technical perspective
Java’s culture eschews common sense approaches
Every Java codebase I've worked on in my career has had plenty of this crap in it. The culture has settled on doing it this way.
Typical immature enterprise organizations tend to extend the system with low-risk new features instead of refactoring and remaking old stuff.