Part of this area belongs to the Cafe "Na Językach", and part to Zarząd Zieleni.  The cafe part was repurposed and fenced last summer by the cafe owner as extra seating space. The other part used to be a plot of grass/wild plants several years ago, until car drivers decided to convert it into dirt/mud for their own convenience. 

This is not marked as an official parking area - as in, designated by the city council (see gis.um.wroc.pl). There have been cases of fines and towing for cars parked there initially. Not sure about now, as the greenery is gone, and so is the basis for the fine. 

Given the above, I don't think OSM should designate it as a parking space, unless the city does it first. 