We had set access=no in October.

The road is still visible on the map but there are small dashes and it is not allowed for traffic.

Car navigation is forced into the U-turn, example here:
https://www.openstreetmap.org/directions?engine=graphhopper_car&route=50.86751%2C4.32585%3B50.86763%2C4.32854#map=18/50.86767/4.32641

It looks correct to me.
I thought about removing the road or making it a pedestrian road or cycle path, but that will depend on whether emergency vehicles can pass through → keeping a road with access=no seems better.