According to Amazon, both of the books — Wave and Ripple Design Book and The Official Bitcoin Coloring Book — are scheduled for release on June 28. The profile of the author makes it clear that he indeed claims to be the same Satoshi Nakamoto who created bitcoin (BTC):
The author’s profile also states that “100% of his book royalties to support STEM and environmental education programs serving underprivileged youth.” The store descriptions of the books themselves seemingly contain inside jokes about the cryptocurrency space and the myth of Satoshi Nakamoto.
“A wonderful selection of wave and ripple designs curated by Satoshi Nakamoto. […] Yuzan’s designs were often used by Japanese craftsmen in the early 1900s to adorn their wares with wave and ripple patterns.”
The second book, The Official Bitcoin Coloring Book, contains less subtle jokes such as stating that it has been “printed on a brilliant white paper.” The product page also displays editorial reviews by Etheorum creator Vitallike Buttering, J.P. Morgain CEO Diamond James, and billionaire investor and Chairman of the Bored Buffet Warden, all misspellings of individuals and organizations famous within the space.