Wrong ! The book is only about Wiking division's panzer regiment. The men of that regiment wore the Wiking cuff-title as opposed to its divisional infantry sister units.
Also to brand the "Wiking" as the 1st foreign division in the w-ss is incorrect.
One of its 3 regiments, "Germania" Rgt's ranks and file remained of German extraction. "Nordland" made up of Scandinavians went on to become a Pzgren Div in its own right though its recruits went on to be Hungarian, Russian and Rumanian volksdeutsche for the most part.
Same with "Westland" originally made up of Dutch and Flemish recruits who in turn transferred into a Dutch division (Nederland), and Flemish division (Langemarck). "Westland" thus resorted to volksdeutsche recruits to reform.
As to divisional units such as the artillery regiment, the tank regiment or the reconnaissance battalion they always remained German for the vast majority of its members.
The first true foreign ss-division stricto sensu was the 13th, the "Handschar" division. The first w-ss formation made up of foreigners and not volksdeutsche.