This 2012 interview says pretty much everything I'd have to say:
Biking's Philosopher Crank.
Every niche hobby, craft and art form has at least one of the same controversial gurus. Nothing new. In current parlance, however incorrect etymologically speaking, they're the "analog" cheerleaders, rabble rousers and flag bearers.
On the plus side, he's no Ken Rockwell, which is a good thing. Unlike Rockwell, Grant doesn't strike me as a troll who posts controversial and simple-minded polemics merely for the sake of driving web traffic and arguments. And Grant's product is consistent with his philosophy. It's pretty close to my own view of cycling at my age (same as Grant's), and that of Velouria of Lovely Bike -- although her essays are consistently couched in the genteel prose of an Edwardian gentlelady. I keep imagining Lady Edith of Downtown Abbey as Velouria.