Yes. The placebo effect can be so strong that people who got placebo
surgeries think they were cured. It's why it's so dangerous; people don't just respond to it a little, they can respond to it spectacularly.
Like you, there's a part to me that thinks that, hey, if it works, it works. I'll never blame or think less of anyone who seeks out this treatment. But is this something that can be replicated? That can be made accessible to more tinnitus sufferers? That can, hopefully, become the new standard of care? To do that, you need to beat placebo.
Edit: to be clear, I have no horse in this particular race. The idea that facial nerves can be a good target for tinnitus and hyperacusis isn't unique to this study, and it probably holds
some promise. I just don't think it holds as much promise as the results you quoted elsewhere make it seem.