Lancaster Gate is complex. There are also: public_transport=stop_position; subway=yes, on the nominal centre of the tracks in each direction within the platform area; railway=subway_entrance, for the actual surface doorway into the station; and a relation: type=public_transport; public_transport=stop_area, gluing them all together.

Surprisingly for such a central station in London, no-one has mapped the actual platforms.

None of them match the name the OP mentions.

I suspect it is a translation of public_transport=stop_position; subway=yes that the OP is seeing, when for user navigation they actually want the anonymous entrance: https://www.openstreetmap.org/node/2206651256 named by the relation: https://www.openstreetmap.org/relation/7216562