Hmm. I'm not sure I'd trust a blog authored by "Gabe Doyle, a fourth-year graduate student in Linguistics at the University of California, San Diego".
There are plenty of sites out there (particularly US-based) which have a "come as you are" anti-prescriptivist attitude to grammar. Many of them perpetuate inaccuracies.
Just as it's equally grammatically correct to use -ize or -ise at the end of a word, the US English approach generally "favors" -ize and the UK English favours - ise.
It is still correct UK English to write "none of the authors is" and would be incorrect to write "none of the authors are".
Though I would much prefer some commentary on Duncan Holley's Employment Tribunal Judgement.