I saw picture of the sign on the junction. It's not an actual traffic ban. The sign exists because this road used to connect to the main road "Τσακώνας - Κυπαρισσίας" on the west, but since it got cut off, for safety they put the sign for those who didn't know about the change, and that the road now only connects to the village. That sign exists for many years, it's not recent.