CPT
Well, I would not like to comment on how a conventional tail rotor would have coped in the same situation but with the fenestron, the airflow is all going through the duct, and in this case, the blades in that duct had stalled. There is no way to regain control of the fenestron unless you unstall the blades and re-apply right pedal.
By definition, fenestron stall is LTE, but I do not believe it is the same thing when compared to a conventional tail rotor.
Gladly there were not too many cases like this one.
Tam