How do you know the name of his birth hospital? Do you work for the family?
Every news source other than UPI says Kapiolani. That includes the Hawaii papers, which I would trust more than mainland paper to accurately document events in Hawaii. His half-sister also says Kapiolani. As far as I know, not a single member of his family has said it was Queens.
Someone at UPI screwed up. It happens. Journalists make mistakes. About and Snopes aren't news sources. They just quote news sources. They probably got their information from that same UPI article, which was mistaken.