SS
You seem to imply in that post that both engines were 'closed down'? That would require both intent and action. I don't think there is evidence yet to support that? Though I do agree with you in some other aspects.
Any tail rotor/fenestron failure I can imagine, would likely have been flyable down to very low speeds. (perhaps our EC135 pilots could help?) Apart from when virtually in the hover, I would imagine massively out of balance powered flight (indeed anything) would be preferable to autorotation into a city centre?
Unless at very low speed, tail rotor failure might not fit the little known information???