What an absolute joke. Google is not god. They cannot possibly ensure that all of their data is correct.

Give that the local government neglected this road for years without placing a single permanent market to close off the road, I’m going to assume that they also never reported the road as closed.

Legally, Google should be in the clear. Technically, I hate that Google won’t take such reports, because I encountered the exact same situation before (except I did not drive through)