Lap time means you’ll be coming around at that point again on track (start/finish) meaning you have to take turns to get there, hence the stiffer sidewall. These are the official tires of many racing series like Spec Miata, SCCA World Challange (dunno if they still are), and quite a few others. I don’t think they’re the official tire of any drag racing series though.
I’m busting your balls, you should know that by now, but you still shouldn’t list something as something it is not.