this info is from Geoportal Berlin / Grünanlagenbestand Berlin (einschließlich der öffentlichen Spielplätze). As I had seen these names in OSM before (in other districts), I assumed that they were ok ( analogue to the Geoportal).  After talking to supaplex030, it's probably more under description. However, there are definitely public playgrounds that have such designations on location, especially those that have recently been redesigned.