Hi, the ref RP4266 was added in this changeset https://www.openstreetmap.org/changeset/164972655

The user has access to an updated list of roads in the country, see https://community.openstreetmap.org/t/morocco-maroc-reseau-routier-mise-a-jour-2025-01/128074

Your source is from 2019, so I believe the reference was correct.