In fact, in Organic Maps, it is shown as "Metro Entrance", with the sole "Metro Station" being shown as Tarragona. This can be missleading, but, as you say, it is up to OM Developers to change the way they render, if desired.

Also, accoring to the official wiki: https://wiki.openstreetmap.org/wiki/Tag:railway%3Dsubway_entrance "name: Recommended. Name of the exit if is known. Not the name of the station (use the public_transport=stop_area relation instead to link with the station). This doesn't include the reference either."

In any case, thanks for all the comments! I will close for now, and feel free to re-open if needed!