Where did you find this definition of the output?
The Wiki clearly says
"charging_station:output=<xxx> kW – Use this to specify the maximum output of the entire station: This value can often be found on the back of the charge points. For a station with multiple charge points, add them all together for the entire station maximum ouput."
https://wiki.openstreetmap.org/wiki/Tag:amenity=charging_station

A matching station with a high enough output on a specific socket you can find by looking at the socket:*:output tags.

It's not useful to tag all the sockets that don't exist. Did you check if there is really no socket:cee_red_63a available? Just add the sockets that do exist.