In this thread, this has been confirmed. I have a 2021 Overland and had the remote start option installed. It will need to be flashed with the sales code and new key fobs programmed.
From my understanding, the 2020 JT Overland will need the new module. The 2021 JT Overland will just need the flash. I am not sure why they made this change, but I have to assume the lack of semiconductor devices and only producing 1 module might have something to do with it.
Update: Just got back from the dealership and my remote start issue is fixed. There is no need to replace the module. The module has remote start built in. Only need the sales code flashed and keys programmed to the vehicle. FCA Engineer suggested to try it and it worked! JT 2021 Overland
I took my 2021 JT to the dealership last Saturday(9/4/2021) to have remote start installed and they ran into issues. The job should have taken 2 hours and I am still waiting for the job to be completed. The issue is now referred to a accessory engineer, but still no end in sight.