One of Grimm’s “laws” for example was …. just another of his fairy tales!... and without any explanation from the 'over 800 pages' of prose the author has. I'll be staying tuned to this site, hoping to learn the truth, or maybe get entertained. If we get a page a day, this'll go on for years.
It's hard to say for sure with the little snippets we have so far, but it looks like the author is pursuing the pseudo-scholarly angle du jour on the distant linguistic past -- popular now in the far north of Europe -- positing a big influence of a Finno-Ugric substrate on the development of modern western European languages.