Dodge never promised to not go beyond the power output of the Demon. It's like the 1976 Cadillac convertible buyers who were thought since GM was not going to build a convertible after that model year, that their cars would be the ultimate collectible forever. So they bought them all up thinking they'd be worth bazillions of dollars in the future.
Well, a decade or so later when GM started building ragtops again, several Cadillackers filed lawsuits against GM for violating the alleged "last convertible ever, forever" statement. As predicted, they were laughed out of court.
Same deal here.
That's the way carmakers work. They add something slightly newer, bigger, better, or more horsepowery, so you're interested in trading/selling this year's car you just bought, for a chance to get next year's car which has some more horses or a new color, or even worse tire selections. 🤪