I found that weird. Only thing remarkable of a very poor story.
I remember a couple of Italian stories from the 50's, written by Martina or Chendi and drawn by Bottaro, where Scrooge is shown to live in his villa/manor, and go to the money bin only for work, like in ducktales and in Barks's stories before 1951.
There were several stories by Jack Bradbury in Donald Duck comics, in the early 1950s, which had Uncle Scrooge living in a mansion house. I remember a Donald Duck story that Paul Murry drew, that had Scrooge living in a mansion. Barks had him living in a mansion house in "Christmas on Bear Mountain", and, I believe in "The Magic Hourglass".
Rainbow Island Rendevousimplies that Scrooge lives in a mansion on the corner of Billionaire's Row and Cash Drive. The only relevant panels:
Perhaps we could see he was actually visiting someone or that the building he's going into isn't a home but some other kind of facility. Still, I think it's pretty clear that he intent was that Scrooge is going to his home in these panels. There's nothing in the story to imply otherwise.