Whatever caused the hard touch down and whatever the rights and wrongs of going around, they did a good job in the end. They had an engine fail on the go around, lost comms (they communicated through ACARS) and the ECAM actions alone would have been interesting to say the least. Then a single engine no nose gear landing? Okaaaay.
I doubt they knew they’d lost the nose gear at the point they binned the approach. They just probably had a stuffed up landing because of the windshear and banged it in, went around and then all hell let loose.