It's impossible to know if this treatment actually works, without doing a placebo-controlled trial. The article itself says that meditation has a similar effect on the vagus nerve. Implants like this have a large placebo effect, as seen from other placebo-controlled trials.
Great research. My intuition is that health science breakthroughs will come from looking at the body as a complex network management problem.
I have just finished reading Ramez Naam's Apex trilogy and I wonder if this is a step towards the future described in that book.