Almost 4 months later, I've send 28 mails to Parrot, got 18 replies back.
In short: Parrot support is not looking at the case, refusing to analyse the smartphone logfile, stating that the last FreeFlight6 logfile is showing a good landing so the drone must be fine. They even stated that they could not find the river near my landing spot ("Kindly note that according to your last flight shared we did not find any river ..."). See picture below..
However, I also contacted Fnac (where I bought the drone) and they were very supportive. At first by trying to contact Parrot themselves, but when that was not working, they asked me to send them all the evidence I had. They analysed the case based on that, and decided within the day to grant me full refund. Happy end after all, thanks to Fnac !
(Keeps open the question why Parrot is not able / is refusing to analyse his own logfiles if they don't come from FreeFlight6 but from their own directory on the smartphone..)
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