The two things have nothing to do with each other. Instagram has its own POI database. Instagram calls the place "Am Negerbad Fischbach", OSM has only saved "Negerbad". These are not the same data. Please direct your complaint to the Meta Group.
https://www.instagram.com/explore/locations/34505723/am-negerbad-fischbach/

So far there is no legal regulation that this may continue to be named locally, so I see no reason for OSM to act.