Unlikely does not equal impossible.
Do you know the aircraft was doing 120 kts???
If it had been close to the hover when the event occurred, then personally I think it would have been very much like a "fish supper"!
Yes, I am familiar with a fenestron, thanks, and I have spent many hours in the hover at night over even less-welcoming built up areas with a fenestron behind me (and only one engine to boot). I have also spent many hours doing the same job these guys were doing in a similar aircraft
But a birdstrike in the fenestron should have left at least bloody marks on the blades, the pic ( which shows the highpower "suction" side ) shows nothing like that.