"Dude, you're just a cartoonist. Are you saying we should take your medical opinion over two actual doctors?" -- My critics yesterday before this came out 

https://twitter.com/stillgray/status/1254987880054714371 …
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He didn’t - just to the entire State of New York....
They did large randomized serology tests throughout NY for this purpose. It has to be a random cut of the population to extrapolate. It can't be every individual that has COVID symptoms.
A random sample is a subset of a population selected by a process that makes all samples of a specified size equally likely to occur. You use a random sample to make generalizations, or inferences, about a population. Did @ScottAdamsSays learn new statistics recently?
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