Personally I didn't read the thread that way. I read it as referring to the situation when a client thinks the issue is different than what the therapist says. I think it can happen with a therapist who isn't really listening or professional - I've encountered cases of therapists like that. Of course, with certain types of clients and disorders it can also be denial or thinking it's not an issue.

Maybe I'm wrong, this is just how I understood that thread.