Yea the LS is a "low" car to begin with... it just has too high of wheel wells.
Also since the car is so long, it emphasizes scraping ability. I remember bottoming out on speed bumps @ stock spring height with a few people in the car.
I am going to say my car is just as low as the one in that ebay link... And I have springtechs... I think it is an illusion with the stock wheel package making it seem more extreme as the stock wheel's offset is set further into the well. Most people who lower that much also go with aftermarket wheels. Like you and I, pektel.
I am going to take a photo of a can next to my car tomorow to see just how low it is, because I think it has sagged down more since first getting the springs.