Was it new or out of another vehicle?
Again, it may be a case of the tech at my dealership needing to forget using the factory software and just go to the basics and use the tech II.
I think that new/used is the key.
Factory software and Tech2 isn't an either/or. While I haven't tried this specific operation I have done a lot with the Tech2, and most things work in a similar manner.
Keep in mind that "Tech2" can also refer to emulation software, so you don't actually have to have the device itself. The dealership had
to use one of the other and functionally they are 100% the same thing.
Basically, there is a selection of things that can be done with a Tech2, beyond which it is used in what is called pass-through mode to connect to GM's TIS2WEB for access to the program files.
Assuming the radio works like other things in the car, the Tech2 can be used to set it up, adjust it, and find out what might be wrong with it, but it cannot program it. It also cannot, on its own, do things that were determined to require intervention above the technician level.
It is impossible to set up any module in a car if that car was not originally programmed to accept that module. For most things you go to a list of available options and select the ones you want. Fortunately a new radio will work without being set up, but a used one has to go through the process to un-pair it with the original vehicle. The problem is that this radio is not one of the available options for the car, even in the source files at GM.
The only way around that would be to select a different year of car, one that the radio was available for, but that is unlikely to work in the first place, and could have unintended (and unpleasant) consequences in other areas.