> The Wiki says "You should tag the laundry area with shop=laundry, and you can optionally tag the individual washing machines with amenity=washing_machine."

This is blatantly wrong, I edited it. For example laundry room specific to a given house are clearly not mappable at all

> I would not want to retag this without local knowledge . Or have you found a Mapillary picture or similar?

I edited based on https://www.openstreetmap.org/note/3142845 - user seemed trustworthy and lack of name tag, location, and changeset description which added it.

I also contacted original mapper who added it in https://www.openstreetmap.org/changeset/104840926