Yeah they do. They are still the NT555R
Taken from Nitto's website about the NT01:
"NT01 is a D.O.T. approved competition radial with an asymmetrical, non-directional tread pattern optimized for dry racing conditions. Originally with a tread depth of 6/32nds", the NT01 can be shaved to 4/32nds" to reveal a "slick" tread surface with two circumferential tread grooves. The NT01 features a racing-inspired tread compound, steel sidewall inserts, and a rayon carcass; all formulated for on-track performance to deliver extreme cornering power for fast and consistent track times."
About the NT555R:
"With the NT555R “Extreme Dragâ€Â, Nitto engineers succeeded in designing a DOT approved, drag racing radial tire that would outperform all other drag radials, provide impressive control and handling, and still deliver up to 15,000 miles of tread life of normal street-driving use. NT555R's are manufactured with the original tread depth of 6/32nds†and are constructed with a specially formulated soft racing tread compound to provide maximum traction. However, this soft and flexible tread will wear much quicker than tread compounds formulated for regular passenger cars. The Nitto NT555R is designed primarily for competition drag racing. "
Just FYI, I'm not trying to say at all that you bought the wrong tires or anything stupid like that, your car is awesome, and those tires are sick, I'm just informing.