Okay, so rotarties are not invited, period. I think that is a strategic mistake but it is stated STL is a sub-2L piston engine class.

But why let the ITS RX7 run at its ITS weight? Somewhere it was written the intent was to prevent poaching of ITS entries. That seems a bit counter-intuitive as the best way to prevent poaching ITS entries is to simply not allow the car to run in the class at all. Indeed, it is clear that class isn't receptive to rotary engines. Was the allowance made to bolster STL entries and get the class off the ground? Seems like a logical path to start a fledgling class although it could have an impact on existing classes.