Okay, I did not hear back from my dealership, so I contacted the On Star advisor from the app. The On Star advisor said that the app when using the remote start will not turn on the heated seats, it only turns on the vehicle. She did say that the key fob remote start will not only turn on the vehicle, but will start the heated seats, so she referred me to a GM advisor named Daniel.
Now Daniel said the remote start should turn-on the heated seats when 50 degrees or below, but he read that there is a problem with the senor for that process is next to the engine and may be part of the problem (the heat from the engine may affect the senor). He also said that the dealership will need to reprogram the module (to change the calculations I think). The bulletin referred to the vin number had a letter, then build date of vehicle (before break date and after break date, I think) will tell the dealership how to reprogram the module. Hopefully, I will hear from the dealership Monday, since it's getting cold out there.