One would have to speculate pretty far on ones imagination, to suggest that a turbine blade failure could tear off a wing.
Agreed. FAR's require containment of a turbine blade failure, and the resulting imbalance should be within the ultimate load capability of the mounts.
A DISK failure, however, is something else entirely. I've seen it cut a fuselage in two. (However, the fuselage appears intact in the CNN video)
Do we know what brand props are used on the G-73T? If there is a fine-pitch failure mode (i.e. runaway), that might be a major issue.