Rotor disk failure? Maybe not
A signature of a disc burst is the creation of several projectiles - usually three - flying in diverging paths in the plane of rotation; the obvious corollary is three holes in the case and cowl.
I see no holes in the outboard side of the cowl.
So - I'm beginning to suspect a pressure vessel burst. The big fans run at very high pressure ratio, and design criteria take the pressures and temperatures and cyclic fatigue into account. Then we have the odd phenomenon of a berserk burner weakening the pressure vessel through local overheating, leading to a blowout (e.g. Kegworth)
Just surveying the available evidence...