Is there a wooden post at that crossroad showing a horse sign to confirm the path is still open? If so, you can post a link to the image here?
It's not an official path of the forest as per official documents and it's not recognised by forest officials.
https://www.foret-de-soignes.be/wp-content/uploads/sites/3/2021/09/Zonienwoud-FDS-MAP-Front-juni2021-gecomprimeerd.pdf