If I interpret the marking on the map and the title of the highlight correctly, then the "black" version of the Alte Statt Trail is probably meant here (which is otherwise qualified as "red" and offers difficulties up to S2). This is officially called "Alte Statt - Wilder Wald" and can, if too difficult, also be bypassed on a forest road. The "wild forest" offers about 300m in length, above all fat roots, steeper passages, partly combined with tighter curves and should qualify with S3. Racy section for advanced riders.