I think most of us had this message, but it was a spam message that was offensive in some way, and GN removed it from the system, but the automatic notifications in our Inboxes remained.
We get this blanket messages now and again. Previous ones have often been attempts to lure us into romance frauds.
You will not have seen the name before because the spammer joins GN just before he launches the spam and, beyond harvesting anyone foolish enough to respond, he, and it almost always is a 'he' probably never comes near GN again.
GN is usually very prompt in removing such spams. Hence the empty messages in our Inboxes yesterday.