There has been a huge amount of attention paid to this newly paved runway with heavy rain and no runway grooving carried out as yet. But all the other flights previous to this one landed safely including a TAM A320 immediately prior to the accident flight. The key to learning from this tragedy is to understand what was different about this flight than all the other flights that landed safely that night. You can see in the video that the accident airplane is in a completely different state (far more speed) than other planes of the same type landing just prior to the accident. Something caused that to happen to this airplane, and not to others. Aquaplaning does not happen to one plane of a certain type at a certain weight going a certain speed and not to another plane of the same type, same weight going the same speed. Something was different about this flight that was unrelated to the runway.
Hydroplaning was initially blamed as the cause of the AF A340 accident at YYZ. Eventually, it was determined that that aircraft landed hopelessly long and fast. My speculation is that we will eventually learn that this plane's landing profile was out of the normal envelope, and then the co-factors (wet, slippery runway, hydroplaning, lack of reverse) all come into play.