The attempts to claim potential efficacy for everything from Alzheimer's to chronic pain to skin necrosis is a classic scam sign. Case reports where the person knows s/he is being treated, are subject to placebo effects, to put it mildly. And yes, one group doing the publishing, with a financial interest, having presided over a decade's worth of fishing, would not persuade me to sign on.
The problem with "neurostimulation," as was also tried with the failed diaphragm pacer product that proved harmful to PALS, is that when nerves are dying, firing them up in certain ways can burn them up quicker. Jump-starting a car battery that can still hold a charge is one thing; jump-starting dead or dying motor neurons is another thing entirely.