Because the Hamilton Depression Scale only measures symptoms and doesn't address the issue of causes (theories), no, it isn't. And the linked study will have to

Because the Hamilton Depression Scale only measures symptoms and doesn't address the issue of causes (theories), no, it isn't. And the linked study will have to be repeated very carefully, with more patients, before it will be accepted as a treatment. And finally, regardless of its value as a treatment, that study can only be a steppingstone toward actually understanding what depression is, in a biological, scientific sense.