Oh no, light aluminum flywheel with a steel insert. And yes, the pressure plate had a twin just in case, and had a special setup for him that took him some time to get right working with Hays. Ran a Jericho, and it was 11-teens at about 480hp. A very efficient car with a truly hyper-focused and intelligent driver.
The reason I said that is Jpar seems to think he should be slipping something on the launch. IMO, HE shouldn't. it should be in the pressure plate/disc/flywheel relationship and the chassis needs some adjustability to be maximized each time a clutch change proves fruitful. It takes a lot of time and money to get a car like that to get scienced out. And if you change a variable (he would add weight and run other classes) it gets a little more complicated.
I don't think doing anything by the pedal will really do much more than mask issues, at the expense of the disc. But again - I'll wait and see.