Can you please verify how and where the Church "still proudly promotes his book, Visions of Glory?"
First of all "Visions of Glory" is not Chad's book, as insinuated. Rather, it is a book written/published by John Pontius from one 'Spencer' supposed account. True, Chad was heavily influenced by this book, but it wasn't his.
Secondly, I'm not seeing that book listed anywhere on the Church' related bookstore, Deseret Book, for sale.
Deseret Book
www.deseretbook.com
I am seeing it listed on the website ldsbookstore.com, but that is most definitely NOT the Church' website, nor its bookstore. Instead this website/bookstore appears to be, from my limited search, a private company based in Orem, UT. This company is as much related to the Church as FedEx or UPS is to the U.S. Government' own USPS. In short it's a privately owned company, whose owners named it such that they could market themselves to an LDS audience and bank on that name affinity/association in order to gain a following.
So, to be clear, Chad's books are not being sold or promoted by the Church. If you have any other information to suggest/prove otherwise, I'm all ears.