Yes, this small node stayed under the radar for a lot of time.  Name, address and location were wrong.

I found some references here:
https://www.infobel.com/fr/belgium/institut_dechamps/forest/BE100006429-023456593/businessdetails.aspx
https://www.espaceinfojeunesse.be/carnet-adresse-categories/ecoles-secondaires-a-forest/

Fixed, thanks.