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There is the "book": /book/show/3...

I am not sure if it ever was a "real book".

The website of the "series" is dead: thephoenixcodex.com
The FB page was not updated since 2017: thephoenixcodex
The Medium profile is also dead: @sergeiborodin

The only place where I could find the "book" is Amazon.
There is no an ISBN in the details there, which leads me to my doubts again.

I also changed (added the space) the author because the author of this "book" definitely has nothing to do with Sergei Borodin it was assigned to.

So, is there some way to find out if it is really a book or not and if there is not, where the information about it has to go further?

Kindles have an ASIN not an ISBN. It is still for sale on Amazon, and appears to be a book, so it seems fine to me.

You can also find coloring pages by Dostoevsky :)) According to Å·±¦ÓéÀÖ rules they are real books. Don't overthink it, just move them to another profile (like you did).

Thanks for the answers.