so much for track day, I guess?

Stuff like this is likely planned in advance with sports and super cars. Since this technology has existed for a while. Assuming you visit a recognized track, wherever it may be, the limiter simply turns off. For example, the 2009 and later Nissan GTR is sold in Japan with a 112 MPH artificial limiter in the software. The limit is there by law. GPS / Sat Nav is standard on this car. If you visit say, Fuji or Laguna Seca, the car knows where it is and turns the limiter off. Allowing you to achieve the ~200 MPH top speed. Examples sold for other markets such as US and EU need not worry. The redline in 6th gear is your physical limiter.

On a slightly related note, clever people have figured out ways around limiters. Such as tricking the GPS or modifying the ECU. Unfortunately, these days it gets harder to do this as manufacturers like Mercedes, BMW, VW, and a few others, are encrypting the communication network physically located in the car. It's not the traditional low and high speed CAN Bus. FlexRay is becoming more commonplace unfortunately.