Dr. Roberts is 100% wrong in his description in this article. He's a nincumpoop (technical term). The clamping force of the lug nut is developing a load between the wheel and hub face, not the hub pilot unless the pilot is an interference fit.
A tapered lug nut is centering the wheel on the wheel studs. If it isn't then the wheel stud is being bent - bending a wheel stud is bad (another technical term). There are wheels designs that are piloted onto a hub and have an interference fit, personally, I've never seen one on a car but that doesn't mean they don't exist. In the truck world they are used. But the lug nuts are not conical.
Here is his contact info
Phone: (913) 438-1038
Fax: (913) 438-1037
Email: [email protected]