This is not a STS or DTS. This is a CTS.
DTS replaced the Deville in 2000
STS replaced the Seville at the same time
The CTS was a new concept at that time and had the uphill battle to replace the Catera and fight off it's bad reputation.
The one the model represents is the first generation, which originally had a Saab V6, BMW transmission, body panels built in Indonesia and it was actually built in Germany. Then they made the very first V-series, which had a Corvette motor and transmission in it.