I think it is because it is the strongest hurricane recorded in history that substantiate that claim.
It's not just another hurricane, it is the biggest ever. What do you need to see? another biggest one ever next weekend, and the another biggest one ever after that?
Currently on track to be the biggest in recorded human history but that is only a small period in earths time line so Im yet to be convinced by this whole global warming is to blame. Look into the current research linking them to Sun spot activity as that has scientific data but again we can only get data over a small time period.