The "word salad" that refers to personality disorders is NOT the same as word salad that occurs as a result of schizophrenia.

The former is a pop-psychology term that is used to describe the type of manipulative speech some people with personality disorders use. That kind of word salad is intentional and controlled. It is used with an end result in mind.

Word salad as a scientific term specifically means a symptom exhibited by people with schizophrenia and certain other brain disorders. It cannot be controlled or "willed" and it is not used to manipulate others. It is a sign of neurological dysfunction.