That is a road for both directions. But only busses are allowed to drive from west to east. Other traffic in that direction has to use https://www.openstreetmap.org/way/1012604822.
Please see https://www.mapillary.com/app/?lat=50.76987903381402&lng=6.0622487522969095&z=18.575360348671403&focus=photo&pKey=191638383175604. No signs indicating it as a "real" one way road, so "oneway=yes" is wrong.