Hi! Please keep in mind that drivers of 4 wheeled vehicles are not the only type of users for residential roads, there are also pedestrians, cyclists, etc. These last can pass the barriers you introduced but there is no way linking both streets.

Also you've detached this path www.osm.org/way/1219974893 from the Rue Winston Churchill

See routing: https://www.openstreetmap.org/directions?engine=fossgis_osrm_bicycle&route=49.505624%2C5.980044%3B49.504851%2C5.98035#map=18/49.504689/5.979588