Way too big, too energetic. Jet fuel/air is much less explosive than gasoline/air and if it had been the fuel it would have been a much smaller detonation. This looked like the air burst of an aircraft bomb.
Could have been a combination of atomized fuel spraying from a ruptured fuel line and on board ordnance exploding. Unusual though. Most helicopter shoot downs involve damage to flight control components and the aircraft just drops and spins to the ground.
Just my amateur observation but usually HE gives a smokey grey explosion while fuel will give you the “Hollywood” orange fire ball.