I enjoyed that article, thanks for the link. It seemed to center on the one bike, though, a rather portly cruiser. I'm inclined to think that we FJR guys ride differently from "those" guys (really trying to avoid stereotypes, but. . .).
Right turns are generally tighter than left turns, especially in town, at regular intersections. I see what he's saying about left turns being longer, thus wearing out the left side sooner, but we tend to wear tires out for reasons other than simple mileage. Most of us enjoy the actual cornering experience, so that the cornering becomes the purpose of the ride, rather than treating the corner as an obstacle to the continuation of the ride.
In that riding style, I believe (completely unscientifically) that the right side of the tire will be more harshly treated.
And SPORT, I knew exactly what you meant, but the slope of a highway centerline to edge is not significant to the tire. That's what I meant by my 20 to 30 degrees answer earlier. If it affected the tire I think we'd see it on the rear, which wears in the center, not left of center. And in comparing rear wear from FJRs to the article's cruiser, I've seen some seriously not-center-worn rear tires amongst us! Another indication of a different philosophy in cornering.