I didn't know this guy had done an 8 volume piece on it, but he undoubtedly brought in all the related materials he could find.
I have a single volume of a book written by a fellow who knew the writer, and probably Myron Payne ~ and I know that Mr. Cline, a family friend, was probably also in that circle (he worked with Indians in various places to reclaim their cultural heritage/baggage).
The little bit of the material I've ever seen is fairly readable ~ provided you have a guide to American Indian sign language (which shows up in it as well) and some experience with Old West Gothic (including that quaint language used in England before the Normans conquered the place in 1066).
So Frode Th. Omdahl, from Stavanger, the Viking's very jumping off place cracked the code.
I wonder if he also earlier studied American Indian Sign Language and if the pictographs matched those standards for ideographic representations.
BTW, the Walum Olem has been considered made-up BS since it was discovered ~ a genuine fake ~ but yet, it was always pretty obvious that it was trying to convey meaning and information. The imprint of actual language is in there. It's not just an apparent jumble of clan structures and totems.
"When he arrived at the site, “I saw an elongated group of markings along the right side,” he recalls. “I’d just read a book on Norse runes, and my first thought was that these were archaic runes.”
He later read about carvings found in Ireland and Wales, usually on the edges of grave markers, that made use of an ancient Celtic alphabet of connected lines and slashes known as Ogam.