By your description, I'd also have some misgivings about this therapist.
I do think many pdocs are more careful about labels and try to mindfully determine the accuracy of their first (provisional) diagnosis. In other words, some of the seven docs were careful/thoughtful about your diagnosis.
As Elsa has mentioned, it can be very unclear as to what is causing which symptoms/behaviors, etc. It isn't always clear.
Yet, I would give sufficient weight to the 7 previous pdocs, as well as giving some weight to my own gut reaction to this new therapist.
As I understand things, pdocs have the ultimate authority for determining diagnose, not therapists.
Have you talked about your own thoughts/reactions (to this therapist's opinion) with this therapist?
I think it's very, very important to pay attention to your own gut feelings and any insights in these circumstances.

WC