I’m almost certain TD2 is just a RPO for cars with vinyl to be either sent or put aside for the vinyl install after production.
This thread has most of the 6th Gen specific RPO codes and shows 5VM for Ground Effects and VTP for Ground Effects - Metallic Black.
For example, one of the cheapest cars that have TD2 is this LS with the only option being the stripes. I can’t find any car that doesn’t have some type of vinyl without the TD2.