Why doesn't Volkswagen official website have a Touareg?

Because it was discontinued! So official website didn't sell it!

German Volkswagen decided to cancel the Volkswagen Touareg model in the US market in 20 18, including not releasing new models.

Volkswagen has a poor record in the North American market. After the new Volkswagen Atlas (that is, Touran in China) is listed in the United States, its length is longer than that of the current Touareg, and its load capacity is increased by 57%. Moreover, the basic version of the front-wheel drive is only $25,345, so it is reasonable to cut off the Touareg.