When the critics cite these sources, it tends to be frowned upon by some Lds FREEPER Mormons. But when Mormons cite them, they're suddenly "A-OK."
Also, the fact that this author had to dig into 26 non-"canonized" sources to string together a Mormon doctrine of the dead and the spirit world shows you that Mormon doctrine is often laced together "on the run" and highly "experiential"...not cohesively formed based upon their "scriptures."
IOW, author had to go to these sources because no such explanation for what he came up with exists in their "scriptures." Even verses from the Bible where Jesus said, "today you will be with me in Paradise" was scoffed at by this author.
Mormon Doctrine is foolishness: 1 Cor 3:19 For the wisdom of this world is foolishness with God. For it is written, He taketh the wise in their own craftiness.