When Motor Trend got the 3.2 0-60 and the 11.6 1/4-mile time at 118-119ish mph, they were accounting for an equal atmospheric pressure altitude. Very rarely do supercharged and especially turbocharged cars get that treatment anymore. The Shelby GT500, CT5-V Blackwing, Porsche 911, BMW M5, etc., have had porky figures published too.
That exact GT63S was given the Hellcat treatment, even though most s/c and t/c cars are supposed to "make more power than claimed." It's got 630hp versus 717-797hp, weighs around the same 4600lb, and comes with AWD instead of RWD.
They even did the same thing with the Maserati Ghibli Trofeo, another rare occurrence of when a s/c or turbo car gets the Hellcat treatment.