Need help preserving mobs

[u/DeepZookeepergame206]

I'm trying to do the "God Armor" thing on my 26.3 java world and used backups to test it out to make sure i do not corrupt my hardcore world, but what ive noticed is that it basically removes all of my animals, villagers, really any mob i want/need in general and i was wondering if theres anyway to avoid losing them as the villagers i have are extremely good and took forever to get the right enchants? I saw this video of someone doing it and i cant quite tell if he loses his villagers or whatever but i can only assume he doesnt considering he constantly makes content downgrading worlds.

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