I don't understand your intention. If you have problems with mapping a member of OSM, why don't you write to him directly? Why do you change something here, although you don't know the situation on the ground? 
The city of Rostock has created a beach access for wheelchair users. Wooden planks have been laid to cross the dune.  The municipality guarantees that the access is in a condition that allows wheelchair access only from 1 May to 31 October. During the rest of the year, it may not be possible to cross with a wheelchair due to sand drifts. 
And that is exactly what I mapped there. 
Greets Protoxenus