Unable to answer "Do you have to pay to use this restroom?" – Restroom – https://osm.org/node/480023808 via StreetComplete 58.2:

I don't see any sign that this toilet is longer in use. I guess that with the new toilet (In the attached picture), the old one will be closed.

Attached photo(s):
https://westnordost.de/p/231957.jpg