No, it doesn't.
You did a good job correcting the wild overestimates of the number of dead from the blast, then you turn around and wildly overestimate the number of radiation deaths...
A "suitcase nuke" would be less than a tenth the size of the Hiroshima/Nagasaki bombs, and even *they* didn't kill more than about 100,000 people *combined*, which includes the blast, fire, *and* radiation fatalities.
Hiroshima and Nagasaki had nowhere near the population density of New York City. Factor that into your calculations.