He is not trying to be an exact minecraft replica, instead of just stating follow minecraft examples, state which things you want.
Ok only the third video, great removed features not under copyright:
- Isometric Screenshots
World Settings
World Type
- Island
- Floating
- Flat
- Inland
World Shape And Size
- Square
- Long
- Deep
World Themes
- Normal
- Hell
- Paradise
- Woods
Further reading:
https://minecraft.fandom.com/wiki/Java_Edition_Indev
https://minecraft.fandom.com/wiki/Indev_map_settings
Also I am sorry that I compared Cosmic Reach that much to Minecraft. I know it must get tiring to see that many comments messing that up.