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.

As someone else point out, the term is stigmatizing, psychosis is a very strong term, and as I very much noted, already being misused and abused.