Makes sense. IoT was a buzzword in 2013. It is now a mature ecosystem and we've gotten a good taste and smell for it. Its on its way towards the plateau of productivity on the Gartner curve if I were to guess.
The sole meaning of the "Gartner Curve" is the amount of money available to be spent on hype, that Gartner can hope to get. It has the most tenuous imaginable relationship with the market for actual, you know, products.
The Gartner Hype Cycle might be branded but the basic delta between overhyped technology vs actual production processes has been observed for a long time.