I'm not sure how to take this rather bold and curiously precise statistical claim... While I am similarly dubious as to the accuracy of infographics, and know many are motivated by marketing, swayed by a political agenda, or exist purely as SEO linkbait, how would you actually source this? I mean, isn't 83.74% of all web content flat-out wrong to begin with?
Either way, The Economist's Megan Mcardle looks into the spurious assertions by popular infographics in an interesting article in The Atlantic.