Some entries in a catalogue are not authorship in the usual sense, and this is one of them. The Complete King James Version Audio Bible is exactly what the title says, and the text it carries predates every modern byline by centuries. The name attached here belongs to the recording rather than to the writing.
That distinction matters, because the craft involved is real and specific. Delivering the King James Version end to end is one of the more demanding tasks in spoken-word audio. The cadence is deliberately archaic, the sentences are long, and the thing has been read aloud in public for four hundred years, so listeners arrive with an ear already trained.
What Christopher Glyn offers, then, is an interpretation of a fixed text rather than a book of ideas. Judge it as you would a performance.