They also note that "a publicist who once owned the house is responsible for placing the plaque." This is a classic publicity stunt: implying more than it claims and staying just this side of an outright lie. I don't know why this owner wanted to publicize his house, unless it was to boost its value on the real estate market.
Clearly the publicist knew that people are fascinated by places where authors lived. I confess that during all the years I lived in Philadelphia, I never made it to the house where Edgar Allen Poe lived for a while, even though the National Park Service does its usual superb job of making it available. However on a trip to London, I did go to Maresfield Gardens to visit the house to which Sigmund Freud and his daughter Anna fled from the Nazis during World War II. It was fascinating to see all his personal items scattered around his study and, of course, the original psychiatrist's couch.