Searching for Duplicator Hacked Client

[yankonl]

Hello guys. Recently I saw a video where a guy duplicates everything with shulker boxes. If someone could help to me find the hacked client, please share it in the thread. Here is the clip where I saw this, just start watching from 9:00 minute.
Thank you in advance.

[notreall]

I think you have to use books and quills or a zombie to drowned converter. The Aristois client has a build in command for the book and quill method.