It doesn't seem to be a binary search in any sense of the computer science term. There is no half interval mechanics nor would that be appropriate. It seems like traditional bargaining.
In an otherwise excellent article, the missing negotiation calibration and example is glaring. The rest of the article would seem to suggest just as you will get your next big promotion from another company, if you find yourself considering coming down walk away. The heart of the approach is getting away from you becoming invested in being hired by a specific company.
