[Rodrunner]

What you're all saying is what I thought. Although, like you said, Tag, the gear and maybe E. brake sensors could make it safe if they never failed, or if there was a failure sense to then lock it out.
I posed the question because after looking at the data I just couldn't figure out where the GMPP option would be useable. If the car is "factory enabled", meaning the Convenience & Connectivity Package, and has an auto trans., then it already has remote start!
Looks like as far as a logical explanation, so far the guy with the fuzzy buddy thingy's got the best/only one.