I wouldn't touch a GMH. If you want to go Goodman, either go the "real" 2 stage with a 2 stage stat or the communicating controller or go elsewhere.

Your quote sounds like maybe something I wrote. The advantage of 2 stage is long run cycles on gentle low. You cannot have that with a GMH or any timer controlled 2 stage. In the car, do you turn your heat hotter when the car is warmed up? NO, you turn it down. Think of that.