I don't know whether the therapist said it or not. It's entirely possible s/he did: therapists often overstate things to "help" their clients understand something.

But the therapist isn't the real issue - your source for this information is your partner, right? And he used the term as a weapon against you. Whether he made it up or is using his therapist's words against you, the issue is him, not the therapist. You can't do anything about his relationship with his therapist; you can do something about your relationship with him.

By the way, there's an internet rule of thumb that in online arguments, the first person to compare the other to a Nazi loses the argument automatically. Same goes for real life.