Deep brain stimulation is not something new, if this is the next step in research in delaying Alzheimers symptoms it is perfectly reasonable. I would not hesitate to advise my mother or father to go this route.
I already have two holes in my head, they are for hearing; and I use a deep brain stimulation process called Gin and Rockabilly, generally about 4x a year to keep it special. The deluxe package includes a neck rub and jokes.
If the day arrives when this no longer does the job, I would gladly go with any experimental technique rather than accept Alzheimer’s, which I’ve some unforgettable, tragic acquaintance with.