All occupancy/loading data seems to be blank

Hi all, I’ve been playing around with the TFL Unified API and I’m specifically interested in looking at loading/occupancy data: the docs seem to suggest that this is returned by line status calls (among others) but unfortunately a call to e.g. (as well as all other endpoints which the docs suggest return occupancy/loading info) returns a crowding section which is just
“crowding”: {
“$type”: “Tfl.Api.Presentation.Entities.Crowding, Tfl.Api.Presentation.Entities”
Is this intentional or a mistake or is there another endpoint I should be using for this?

edit: being a dummy, didn’t spot the /crowding/<naptan> one, probably (sinfully) getting confused with the National Rail API