Back in the late 70s, doing the A300B4 course, the supposed aerodynamic braking technique was definitely being taught by Airbus then. Most of us thought it was a bit odd and more or less ditched the practice once we got on line. As far as I can recall it was not being taught on the A310/300-600 a few years later.

Could it be a Concorde legacy ? ... just a question.

Don't know about this aircraft in particular, but in other types WOW signals are latched for several seconds so the conditions necessary for spoiler deploy can be valid even after the aircraft has left the ground; it's done to prevent spoilers popping in and out during bounce.

I think the dingus which determines Air/Ground Transition stays in ground mode for several seconds (4?) after the main gear struts compress..
Wasnt there a case of an A320 bouncing because the pilot touched down with some thrust added, and after the pilot retarded the levers, the ground spoilers deployed in the air and the second landing was so hard it damaged the aircraft? I beleive it was an Air India A320?

Is there a report available on that? I'd be interested to read it.