B.S.
I agree. The analysis is based on deaths per 100K. A lot of rural counties voted Trump, but take Slope County, ND, with a whopping 732 residents in the last census. a single death would plot as 137/100,000, which makes for some pretty distorted plots. Keep in mind the actual number of deaths might be a small fraction of the rate per 100,000, which would be less distorted in urban areas of 100,000 or more.
It isn't that the rates are incorrect, it is that the picture they give is out of whack with the actual numbers.
Deaths per 1,000 or even 10,000 would show less distortion.