It's clear that the car hit the tree at a high rate of speed. A stuck throttle can be overcome by bearing down on the clutch but this car has so much power the driver might not have reacted quick enough to avoid a spin-out, thus striking a pole and tree.
According to the Wiki article on the Carrera GT, it was initially designed as a sports-racing prototype. Performance-wise, it is probably the least compromised car they have ever produced for public consumption.