blancolirio channel said that the fire continued on the ground. Assuming all shutoff valves worked, all fuel in the engine should have burned off by the time and/or been flushed out, so I think it may have been an oil fire.
The imbalance of a fan-blade-off event will be violent enough to shake the cowling to pieces. Combustion chambers are not known to explode; they are designed to contain an extremely fierce fire, and are open on both ends.