Tyre underinflation theory
One might expect certain parties to suggest that the tyre was underinflated prior to touchdown... The QAR will quickly solve that problem, because A320 airplanes are, I believe, all fitted with TPIS (tyre-pressure indicating systems). [Certainly on the ones I flew.]
This system also triggers ECAM (system-monitoring) warnings of tyre low-pressure to the pilots in most flight-phases, including the approach to land. The pilots would receive a "Master Caution" audio/visual warning, with the L/G page displayed on the bottom-centre EIS display, and the offending tyre pressure colour-coded.
However, the tyre could have been shredded during the previous departure, while remaining fully inflated.
Hope this helps.