Indeed, this is what seems to have happened.
The aircraft appears to have been towed onto E47 or E48 around midnight, both being open stands that OS aircraft like to spend the night on. These stands are rather flat, in fact, they never struck me as having any slope at all unlike a few other stands at VIE (although synoptically, the general slope of the apron is downhill when going north). For some reason, securing the aircraft after the tow seems to have been neglected and it started to trundle backwards across the taxilane into stand F31/F33, where it first met the passenger bridge with its horizontal stabiliser and then a rather solid light mast with its aileron. VIE has rather little traffic at such ungodly hours and the apron is not at all busy then, so it may well have taken some time before the incident was noticed.
For what it is worth, wind at that night was around 150/10, fitting the general direction of LZQs escape.
At the moment, the aircraft is under examination in the maintenance hangar out of sight. No word on a further course of action is out yet but some alarmist media in Austria have called for the scrapman already. An investigation into the causes is in progress and I also dare assume that the phone line between Austrian maintenance and Airbus engineering is finding good use at the moment.
Letīs wait and see...