Eifelkobold!
Hi, maybe he trusted the post from Bad Münstereifel or maybe her insurance offers telematics and it was possible to drive here but not allowed?

Now all sources from Straßen NRW and Bad Münstereifel showing this road as open. It seems they are working just at one lane without full closure. I removed the restrictions and reopened the road in Changeset 118885137 (https://www.openstreetmap.org/changeset/118885137).

Greetings

Eifelkobold