I bet Nikon is providing him not only with free Nikons but a lot of cash as well.
I quite liked McNally's writing and photography until the tedious Nikon bias that now seeps through it. It would be the same regardless of brand, by the way.
I read a book of his about lighting, except it was really about lighting with Nikon gear. He said lots of things in the book that were simply incorrect if using other brands and the book felt like a Nikon brochure, but pretended to be otherwise which is something I find deceitful. If the book had been called lighting with Nikon flashes, that would have been fine. Advertising pretending to be editorial only gives me negative connotations about the brand.