The mortality stats were done in the same way as Katrina, not from looking at lists where the cause of death might be given as "diabetes." The method of analysis gets at situations where a storm, and aftermath, lead to a death that otherwise wouldn't have happened. Say, power is lost, an insulin supply is ruined, fresh insulin doesn't get there....the coroner doesn't write "Maria" on the death certificate, so you can't go by that. You look at average mortality rates on a month, then compare with rates after the storm, which will reveal the differential. Many people died from neglect and help not reaching them. You don't just count direct cause like "tree fell on head. " And, no, you don't go off a list of COD, for the reason I just explained. Trump wrote in ignorance of how stats were analyzed.