Visit from a deleted neighbour?

Yes there was another thread on this, but it is not fixed, that is for sure. I also had this happen to me for this first time recently. I also just deleted some nonplaying neighbors because of this event, and that was one of the deleted neighbors who visited. I was wondering if they actually did visit, or if their name just appeared as a glitch. I can't check when they last logged in because I am not their neighbor anymore.