Transavia is saying there was no technical problem with the aircraft, that would suggest the crew decided to do a flapless landing.
That would suggest insider knowledge, or friend of a friend. It would be interesting to know the individual experience/qualifications of the 2 pilots and to hear the CVR prior to deciding this non-normal landing configuration. Was there a step cockpit experience gradient? It's not common these days in the LoCo's to have old fart RHS guys. Equally it's quite common not to have old farts in LHS, but I expect not too much in HV.