Even if you were assuming the patrons were all American (obviously false) the most popular creator would have fewer than 1 in 10,000 people subscribing.
Patreon is an obscure way to fund yourself that a very small number of people make their living from, it's not a bellwether for the American heart.
I don't know what high brow things the author finds missing from the list that would change his conclusion, but this seems very much like a conclusion looking for scant evidence for to justify something to write. That page would have been better left blank.