Hawaii isn't considered international, from the perspective of the US - it's domestic. Notice that there also is not a trip to Alaska shown, though he did visit Alaska. (And, trips in the mainland US are not shown either.)
The URL at least is really dodgy, looks like a phishing scam. At a quick glance the gov1 can be mistaken for gov/ and lead people to think it's the official White House website. I'd think twice before clicking through.