That is exactly the fallacy of reversing the burden of proof. The one making the claim of the form "X exists" or "Y happens" (the two being trivially equivalent), a.k.a., a positive claim, is the one who needs to present the evidence. Saying that you're right about such a claim because the negative wasn't supported by compelling evidence is nonsense.
I mean, watch me do the same: the black dragon Alduin exists and he's going to return to devour the world, including Heaven and Hell. And I know that's true, because none of the naysayers claiming he doesn't exist has presented any compelling evidence to support that.
Now I realize that it's not easy to show that talking to someone isn't just placebo effect. I do realize the problem of having a control group who only think they're talking to someone about it, or for that matter going double-blind about THAT. It's not as easy as giving one group the new antibiotic pill and the other group just pressed lactic acid pills. In the case of pills, neither the patients nor the one giving them the pill can tell the difference, so double-blind works. It's not as easy to make someone just think they're in a group therapy session, when they aren't.
Fair enough.
But that still means you don't have evidence for the positive claim. And that's it.
It doesn't change how the burden of proof works. You don't get to then claim to be right because nobody proved the negative.
I met someone who was very anxious and upset. I asked why they were anxious and upset, and it turns out it was because they couldn't turn their ignition key to get their car started, and they were running late. I advised them to try forcefully turning the steering wheel (even though with the key not turned, the wheel won't move very far) to unstick the ignition lock. This worked, and they soon became less anxious and upset.
I consider that interaction to have helped that person.
You can argue that that wasn't really talk therapy, because it involved giving and applying practical advice for a specific situation But there's nothing in the definition of talk therapy that prevents (or even makes it unlikely for) such situational practical advice from being given and applied as part of the process.
I suppose you can still claim "talk therapy that doesn't include giving and applying practical situational advice never helped anyone" without having been contradicted by evidenced positive claims, yet.
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