A major factor is age. Except for frum Yidden, New Yorkers have very few children, and while children become infected they generally do not get very sick. Not only to frum Israelis have lots of children, but even the secular Israelis of Jewish descent, as well as Israel goyim (largely the Palestinian Arabs) have a birth rate that while lower than the frum community’s, is radically higher than in any of the other developed countries.
So you can see a lower death rate either as a quirk of demographics, or due to Ha-Shem rewarding those communities that observe the mitzvah to be fruitful and multiply.