Just noticed this book too, seems more NetSuite books are starting to appear - https://www.amazon.co.uk/NetSuite-Security-Audit-Field-Manual-ebook/dp/B079N5ZFHJ

I like this book it helped me during my SOX and COSO audit immensely. Zach Wear the author sent me this book as a complementary copy last year.

Yes, looking forward to reading it - I see they publish a new copy for every NS update

Do you have to repurchase it every update?

That was actually my first thought, didn’t see any option of grabbing any amendments/updates. Actually just arrived so will take a look and see if there’s anything inside about updates