Your deaths figure seems to be for New York State, while your population figure is for New York City.

The correct figures (as of April 18, 2020) is:

New York State: 14,636 deaths / 19.45M population = 0.0752%

New York City: 8,893 deaths / 8.3M population = 0.1071%

Worldometers is likely more accurate, it gives 17,671, not 14,636.

https://www.worldometers.info/coronavirus/country/us/

New York State have a population closer to 20,000,000. I'm not saying Giesecke is right, but he could possibly be much more right than the official WHO number. I don't think you can compare the death count from place to place that easily either, you have to take the general health of the population and how the medical services have coped with it.

I think that’s a misleading denominator to use, because we don’t know how those that haven’t got it will react once they get it. Better to use actual infected or some mix of recovered and currently infected. You will get a 10x higher number at least.

I think it's that denominator just to demonstrate that the 0.1% figure is totally made up and ridiculous.