>Why not use man_made=charge_point: https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dcharge_point

Потому что согласно https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dcharge_point "is used to map the individual physical charging devices (sometimes also known as "dispensers" or "stalls") at charging station sites"

но здесь у нас НЕ charging station 