Hello 5HAD0W@Brighton&Hove, and welcome to OSM!
I'm not sure what change you were trying to make here (and as you can see from https://osm.mapki.com/history/node/12709957 , someone has already reverted it).
This station has had "usage=tourism" on it for 10 years or so, so no map that is actually bothered about it is going to mistake it for a mainline station.
See e.g. just up the line at https://map.atownsend.org.uk/maps/map/map.html#20/54.43633/-0.72513 - you can see the mainline station in blue, and the NYMR one in brown.
Best Regards,
Andy