I was bound to agree with you before I RTFA. The classification is useful for a psychiatrist, i.e. someone who wants to help the person.
"Bad coworker" can have many causes. In prolific AI psychosis, I think the assumption (differential diagnosis) is, they became a "bad coworker" due to use of AI, so they were a "good coworker" before.
No, the term itself is not stigmatizing. People stigmatize legitimate psychiatric diagnoses, and you're perpetuating this idea in your comment, by blaming the term for the moral failure. These labels don't exists to stigmatize people, but to study the problem and help people.
"Bad coworker" can have many causes. In prolific AI psychosis, I think the assumption (differential diagnosis) is, they became a "bad coworker" due to use of AI, so they were a "good coworker" before.