Of course Tesla is going to want YOU to provide the VIN. It's not Energica's job to provide them the vin for every vehicle sold as I am sure there are probably very few tesla stations in certain parts of the world. When it comes time to pay for the charge, it will be YOU that pays, not Energica, so they will need YOUR info. How would Energica know if a private sale was made and who owns the thing now?
They made themselves fully compliant with the latest update, and are just waiting for Tesla to turn it on basically at this point. This does not mean that protocols won't change further for any or even all vehicles in the near future as the universal charging rolls out and they may find they need some extra controls in the protocol.
As for over charging your vehicle, it won't happen, that's why they talk to each other, if they do not agree, then the charge does not happen.
Aaron