Hi,
This area does not look like a riding centre, it looks like an area with some paddocks. The tag leisure=horse_riding (riding centre) is not appropriate for such an area, it is for the whole riding centre, in this case for https://www.manegehillegom.nl. This riding centre can be mapped like https://www.openstreetmap.org/node/2731269675. See also https://wiki.openstreetmap.org/wiki/Tag:leisure%3Dhorse_riding