I received the vouch and I think it's original ebook as the instructions inside is created based from experience.
Yes, looks like promising as the ebook got all the details you need from Reselling, Cracking, selling Legal Xbox One Accounts, right pricing and buy and sell method.

This method involve creation of account on other website, little knowledge about those games he mentioned and time as you will not earn instant using this method. It takes time but once you get it this can be a stable income or even personal benefits if your a gamer.