That is a lower limit on the IFR in NYC. They also have more people over sixty two than city of Seattle has people. So, much more dense, with about 13% of the population an at risk group.

And calculate that IFR per age band. Running WA numbers in https://news.ycombinator.com/item?id=23080035 shows that the IFR here ranges from .7% to 15%(!) if you do that.