Hello,
no, the road is not under renovation, it's only closed because the "Haarbachtalbrücke" (https://www.openstreetmap.org/way/455182334) is damaged. The motorway maybe will be reopened to cars up to the planned rebuilt of the bridge. Please respect the tagging made by the local community.
Reverted with https://www.openstreetmap.org/changeset/139135950.
Regards