When the hellcat platform emerged, it was new. Dodge never had a performance production car using that engine, supercharger and trans. There was no factory support and little aftermarket knowledge about the platform.
Compare that to gt500 which uses existing engine technology, and a trans adapted from the Ford GT. Combine that with all the factory and aftermarket resources of Ford and why would anyone be surprised that and fbo racecar runs 9.2 in negative 1k DA. And yes, they are chasing air and baro to get their number. Car is based out of FL but ran th number at MIR? Why? To chase the air. That car is on full tilt and the blower and trans in it aren't happy. I suspect a trans and / or blower failure will occur before the car goes 8s