Surely the question of whether or not there was a wake turbulence encounter is irrelevant? The Airbus should be strong enough to survive easily.
What i think we are seeing here is the first instance of structural failure of Carbon fibre composites when used as primary load bearing structure on a composite (ie alloy+CFC) airframe. We all know this material is good for doors, flaps, fairings etc, but these are all either hinged or non load bearing. We also know that it makes great all plastic aircraft.But when you make an aluminium aeroplane with a bolt on Plastic tail, you need to spend a lot of time making a joint which allows all the loads to pass but is good for the different materials on both sides. Perhaps we have a bit of the learning curve still in front of us here. I suppose this amounts to idle speculation, but it was a most unusual accident.