I'm a jet mechanic, having been forced to retire when A.T.A went under after 19 years. I doubt seriously that the APU would've still been running after the aircraft departed the gate area. Most airlines request the pilots shut them down as a fuel savings measure if nothing else.
I don't have any Airbus experience, I've worked Boeings and Lockheed my entire career, but I would have to guess that besides the two engine driven generators, the aux power unit or "apu" with it's generator, and the battery, there is probably a "RAT" or ram air turbine (think of a mini-windmill that swings out into the airstream) of some kind. On boeing aircraft the "rat" is used to power a hydraulic pump which would in turn provide pressure to operate a hydraulic powered generator. I didn't see a "rat" deployed in any of the photo's.
My guess is he still had sufficient engine RPM to power the generators on the engines or he was on battery at the point of splash down.
There is enough fail safe in most commercial jet designs that would ensure that basic instruments and some ability to control the aircraft even if its in a prolonged glide are available.
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