Your link clearly says Japanese at the “Language” line at the bottom. Japanese is in the Title from Amazon also.
Yes, it does say “Japanese”, but at least it says Japanese in English, not in German or whatever language that was on the first post’s link.
My Kindle took longer than I thought it would to download the pages. So far it has downloaded about 80% of the book. Most of it seems to be in Japanese, however, there is an essay at the very beginning that is in English, and it’s about 8 pages long. The author also provides resources to 18 of his published peer reviewed articles.