The file to extract was moved just a few line above!

Scripts/developer_scripts/create_new_release

@@ -324,7 +324,7 @@ if [ -n "$DO_PUBLIC" ]; then
   if docker version > /dev/null; then
     # Re-extract the full version of CGAL, with examples/, and doc_html/
     rm -rf ./${public_release_name}
-    tar -xf ${public_release_name}.tar.xz
+    tar -xf "${HTML_DIR}/${release_name}-public/${public_release_name}.tar.xz"
     # Build the Windows installer
     docker pull cgal/cgal-nsis-dockerfile
     docker create -v `realpath ${DESTINATION}/${public_release_name}`:/mnt/cgal_release:ro,z \