Pure straw-man, no-one is arguing that.
And more importantly it doesn't change the result - regardless of whether 84% or 80% or 88% believe that DNA in food should be labelled it is a too high amount. (Unless it refers to pure DNA - or large quantities of added DNA - since excessive amounts of DNA is not healthy as far as I recall.)
However, the math is not merely ignorant, but also wrong. The margin of error depends on the result (this is something that many miss; even with basic statistical knowledge.) So for 1000 persons and 99% confidence a result of 50% would be 50%+/-4% but 84% would be 84%+/-3%.
Similarly to get 1% margin of error around 84% you don't need 16640 but only about 9000.
Infracted - do not post to continue a derail when you were specifically informed not to
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Everything isn't included on the labels, because that would be ridiculous:
https://jameskennedymonash.wordpress.com/2014/01/05/ingredients-of-an-all-natural-egg/