This prediction is based on feeding past hurricane data into a global climate model. Here is the abstract of the research paper that TFA (in Wired) is based on:

This prediction is based on feeding past hurricane data into a global climate model. Here is the abstract of the research paper that TFA (in Wired) is based on: > ABSTRACT: Tropical cyclone (TC) track characteristics in a changing climate remain uncertain. Here, we investigate the genesis, tracks, and termination of >35,000 synthetic TCs traveling within 250 km of New York City (NYC) from the pre-industrial era (850-1800 CE) to the modern era (1970-2005) to the future (2080-2100 CE). Under a very high-emissions scenario (RCP8.5), TCs are more likely to form closer to the U.S. southeast coast (>15% increase), terminate in the northeastern Atlantic (>6% increase), and move most slowly along the U.S. Atlantic coast (>15% increase) from the pre-industrial to future. Under our modeled scenarios, TCs are more likely to travel within 100 km of Boston, Massachusetts, (p = 0.01) and Norfolk, Virginia (p = 0.05) than within 100 km of NYC in the future. We identify reductions in the time between genesis and the time when TCs come within 100 km of NYC, Boston, or Norfolk, as well as increased duration of TC impacts from individual storms at all three cities in the future. Notice that the research is not saying anything about the frequency of these hurricanes. Even if simulating 35,000 hurricanes and feeding it through a GCM produces something interesting, I'm not entirely convinced by these findings. The GCMs have enough tuning parameters that it's likely one could get any result one wants from one. Even if the authors did a very good job with their simulations, the results might only apply to very rare hurricanes that happen to travel within 250 km of NYC. In support of the research, it is published in Earth's Future that is peer reviewed.