This parking place is not public any more! It is owned by this company:
https://gesaeuse.at/unterkunft/chalets-four-elements/

Sometimes the gate is open, so if a driver miss the sign it is a trap because then you cannot get the car out.

The new parking place for kayakers/rafters is next to the restaurant right next to this parking place:
47.68927, 14.77663

But it is not free either, every car has to pay a fee.