Good question, who knows. He married Debbie on May 7th and issue is dated the 11th, so I'm thinking he certainly had marriage on the brain before this went to press. (And to think he only had 6 months to live.)
Your guess is as good as mine as to whether he wrote it. It's not the first time he would have done so since he was doing it since the 30's. If he didn't, it looks like it might have been lightly ghostwritten only (?)
BTW, don't you love the "...Annabella bosses Tyrone?" title :-)! Oy!